ar15 fire control pocket dimensions

02 Dec 2020
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Jpowers, Feb 22, 2009 #6. With a little patients anybody can do it. The AR-15 was first built by ArmaLite as a selective fire rifle avoid any possible problems. tutorial, the jig can be used for much more than just drilling the side holes in the lower receiver. Optics. Lower Parts Kit M16. I drilled the detent hole first with a (F) #40 drill. So if you need a dimension while working on your project, you will have to reference the model. If you are interested in installing a burst fire control group in an AR-15 it is not only illegal but impossible due to the differences in the fire control group wells--there is no room for the auto sear. With the transfer punch against the lug and on the 0.250” scribe line, I made the center mark… AR Build 00023 To control the depth of the holes, Modulus Arms includes a drill stop and a template. This unit accurately locates all of the drilling holes for either platform of semi or select-fire. worst case scenario it will mess with your trigger springs a little bit. The next hole I decided to drill was the front take down pin detent hole. Now it was time to tap the buffer hole with the (L) 1 3/16-16 tap. Joined: Feb 10, 2008 Messages: 201 Location: Austin TX. style 80% lowers ***, Outline: center of where the safety selector IV.   - CNC Gunsmithing Drill Jig Take the same precautions when drilling this hole as taken with the front take down pin detent hole… AR-15 carbine receiver extensions should be 1.14″ in diameter, also known as “mil-spec” in the advertising world. Colt AR-15 CAD Files Note the following files are for reference only, and are not intended for use in production of an actual firearm or sear. One adapter allows you to drill the hole locations and the other adapter allows you to remove the material using your drill press. Below is a pic of the drills & taps I used. Fire Control Group Pocket (Rear) - Anderson - Aero. "store bought" AR15 was it has a silver lower receiver. After a few turns of the tap, you should have something that looks like this… I slapped an upper on this new firearm and took it out shooting and I didn’t have any problems at all. Upper Parts; Lower Parts; AR 10. Unless otherwise stated, every hole is drilled all the way through the receiver. Just be sure to take your time, and always remember to measure twice and cut once. I. %PDF-1.5 %����   - Drills & Taps: The blueprint can be used for reference So that is why I want to show how somebody can complete an AR15 80% lower with typical tools usually found in their garage. I put the (I) #42 aircraft extension drill in my cordless drill and drilled through both ears of the bolt catch area. I clamped a flat surface to the top plane of the jig and then scribed a line at 0.250”… AR15 Lower Receiver Blueprint PDF DOWNLOAD. II. I believe anybody can finish an 80%’er if they have The AR-­‐15 Jig Manual Ver. Again I locked the spindle in with the (F) #40 drill touching the center marked surface and set the drill depth to 1.125”… endstream endobj 15 0 obj <> endobj 16 0 obj <> endobj 17 0 obj <>stream Many companies still sell their lowers with M16 trigger pocket dimensions, they are just missing the proverbial "third-hole".Drilling that third hole is what legally changes your AR-15 from a semi-automatic rifle, into an illegal machine gun. below are items that make the job easier, but they aren’t required. Fire control pocket milled out -, By: Justin / jwh02017 3.4.2 Firinq pin indent. Then I set the drill depth to 0.188” The last step is to drill the trigger guard pin holes. Pretty much the same as above from both companies. I wasn’t too worried about the life of my CNC jig since I usually machine all of my stuff on a CNC machining center, but if you want to extend the life of your jig, you can use transfer punches to center mark the locations of the holes to be drilled instead of actually drilling through the jig. Below is a pic of the hammer pin hole being drilled… I drilled both holes while the jig was laying on the left hand side of the receiver. LJH Member. make sure they are good and sharp to There are only two small operations which would make an ar lower select fire capable. It’s a little bigger than what is called out on the blueprint, but in my experience I would rather have this hole a hair bigger because the last thing you want is the spring or detent getting stuck in this blind hole. The first line I scribed was the distance from the top of the buffer tower to the center of the 1/2" hole, which was a distance of 1.696”… And below is a pic showing the completed safety selector detent hole drilled… This drill is used for the hammer and trigger pins and also the bolt catch plunger hole.   - Bubble Level Here’s a pic showing that…        - (F) #40 Drill For Class 2 manufacturers to easily and accurately place the holes for factory select-fire components into a previously semi-automatic-only weapon. or tap to use in each location. AR-15 Lower Parts Kits from $49.99 at Palmetto Armory AR-15 Lowers from $84.99 at Stag Arms As you probably noticed several of the holes in the AR15 lower receiver are not critical at all. This drill is used for the front and rear take down pin holes. The next set of holes I drilled were those located on the buffer tower. Date: 6/5/07 *** NOTE: This tutorial uses Kevin's older style 80% lowers *** Outline: I. Tools Used More details. So to solve this problem, I decided to just turn the drill chuck by hand while applying a little down pressure on the drill bit. Suppressors. 10 ft-lbs of torque. Then I used the (G) 1/2" drill to drill down approximately 1/4".   IV. I had to use a piece of board for the block and jig to set on since my drill table wasn’t large enough… Full-sized rifles use a fixed buttstock, while carbines generally use an adjustable telescoping buttstock. I used the dremel with a sanding stone and ground a little indention for the clearance. starting the 1/2" drill more forgiving… switch hole. Again, go slow and use plenty of cutting fluid and you shouldn’t have any problem tapping this hole by hand… The BATFE have ruled that no M16 auto or burst parts can be installed in a non-NFA registered lower. Tutorial: I started with an 80% AR15 lower receiver from Kevin (Email: Visually rough out the large pocket of the fire control pocket, but not the rear slot, to a depth of 1.250”. Below is a pic of this hole being drilled… In today's market, Armalite style and DPMS style are the two most popular specification that manufacturers use when making AR-10s. I set the jig on the drill press table with the buffer tower facing down, then took my calipers and measured up 1.931” and made a scribe line. You can use a smaller diameter transfer punch, but with the 0.216” you can set it up against the wall where the pistol grip will slide on. www.cncguns.com You may have seen some of the other projects I’ve completed using CNC machining centers. Instead of scribing the other line, I decided to use a 0.109” diameter transfer punch and set it against the take down pin lug… However, this is not a rule. The idea to drill and tap this hole is to slide the pistol grip on the lower receiver, and then use a sharpie marker to mark the location of the hole. 0 This is a little fast for this size of a drill. Readme for Scratchbuilt AR15 Receiver Blueprints By elmgrove1765@yahoo.com 1. AR-15 Fire Control Group Laser Cut Disconnector. Related Products. Simply slap jig on the receiver as show below and secure it with a C-clamp. Release Dates June 2002: Scratchbuilt AR15 receiver project completed and test fired Oct 2002-Mar 2003: Incremental release of readme.txt and all 11 parts blueprints: sideleft_rev_A.pdf - rxvr left side plate sideright_rev_A.pdf - rxvr right side plate fcwell_rev_A.pdf - fire control well bottom … Disclaimer: This article will discuss the process of completing an AR-15 80% lower with common tools found in most hardware stores. To locate the drill to the pre-drilled hole, I simply kept moving the jig and turning the drill until the drill was even on all sides of the hole. Riss Member. during the project. Here is a pic showing that… Now there is an X and Y scribe line and you can simply drill where these two lines cross. 33 0 obj <>stream Below is a pic showing the jig is level left to right… When drilling this hole, make sure you go SLOW, take small pecks, and use plenty of cutting fluid. So with the (D) 5/32 drill in the chuck, I locked in the spindle with the drill touching the center mark…   - Irwin Quick Grip - 8" & 12” Next I scribed the other line for the 1/2" hole. Conclusion: Addeddate 2016-02-09 07:52:59 Identifier AR-15_Scratch-Built_Receiver_Blueprint Identifier-ark ark:/13960/t6n056g1g Ocr ABBYY FineReader 11.0 Pages 68 Unless you are able to get the jig very secure, this size of drill will tend to vibrate and chatter in the hole.   - 2x4 piece of wood - 2.50” tall (I have not verified any dimensions) 11-30-2015, 07:45 PM #4. Next I drilled the trigger pin hole… The jig makes this one of the easiest steps in the 80% project. If you buy a drop-in auto-sear that was manufactured after November 1st, 1981. it is by itself classified a machinegun, and must be serial numbered and registered with B.A.T.F. Some people get Of note, the Anderson's grip screw hole is not threaded all the way through - they have had some issues in the past with these threads stopping very short, and not allowing the use of a 1" long standard grip screw at all. There are several manufacturers making kits to allow select-fire with the Lightning Link by modifying real M-16 fire control parts to function with the Lightning Link in an AR-15. Introduction II. best case scenario, it works. This compact jig assembly is designed specifically for 80% mil. Then I scribed a line for the detent hole. It uses a (D) 5/32 drill for a depth of 0.188” and a (C) 1/8 drill all the way through the hole until you reach the 3/8 selector switch hole. Receiver Extension Dimensions Because I used an A4 rifle in this example, the dimensions of the receiver extension aren’t mentioned. To do so is to create an illegal machinegun and can lead to hard prison time. I used a 0.216” diameter transfer punch… Basically the idea is to get the jig in a bench vice setting I scribed a line that was 0.748” from the left side of the receiver to the hole location… See Figure 6. I bead blasted the lower before I started this tutorial to give a better contrast of where cuts will be made. Here are a couple pics to show you what I’ll be starting with. Doing this will make I then used a center punch to mark the locations of the two holes… AR-15 Fire Control Assembly; AR-15 Front Sight Assembly; AR-15 Gas Tube Assembly; AR-15 Lower Receiver; AR-15 Rear Sight Assembly; AR-15 Sliding Buttstock Assembly; AR-15 Upper Receiver; M16/M4 Lower Receiver - Fire Control - Burst; M16/M4 Lower Receiver - Fire Control - Full Auto; Schematics are the property of, and trademarks are registered to, the individual manufacturers, and … To better support the jig and receiver, I used a Columbian Clamp. Later on, I hope to make available other files dealing with my projects...including sketches, setup sheets, programs, etc. I bead blasted the lower before I started this tutorial to give a better contrast of where cuts will be made. audibk@yahoo.com) He sells the nicest 100-500-152WB AR-15 Fire Control Group Stamped Disconnector. The hole for the magazine catch was already drilled when I received my 80% lower so I didn’t have to worry about drilling that hole. The 80% AR15 lower receiver is now 100% complete firearm. With this center mark it will give the drill point a place to start. The next step is to use the (I) #42 aircraft extension drill to drill the bolt catch pin hole. spec. I wanted to use the (D) 5/32 drill first, because usually if you try to use a larger drill into a hole that is already drilled smaller, the larger drill will sometimes chatter since it’s not taking a full cut. The pic below shows the pistol grip on the lower ready to have the hole location marked… In order to get the next scribe line I had to remove the receiver from the jig, but it’s not a big deal because it’s easy to re-align the receive in the jig. It is manufactured with the extensive use of aluminum alloys and synthetic materials. The drill press was operated at the lowest spindle speed of 540 RPM’s throughout this project. I. From the top surface of the jig, you need to drill down 1.500”. AR15 to M16 Class 2 Drilling and Check Fixtures. The rear hole goes all the way through, but the front only goes through the right hand side of the receiver. detent hole will be. have to use new drills, you just need to To do this I turned the jig upside-down and set it on the edge of the drill press table. The CNC jig takes all the guesswork out of finishing this project. should hit the center of the selector Mfr Part: 709100021520. walk off position. NOTE: This tutorial uses Kevin's older The early commercial SP-1 AR-15s used a pair of .250" diameter receiver push pins, identical to those found on the military rifles. 12. Next, I used the (C) 1/8 drill to drill the front and rear trigger guard pin holes.   (Optional Items) You don’t have to remove these forging marks, I just think it makes for a better looking lower. Below the trigger slot adapter plate image you will see the milling adapter kit to help you remove the material from the fire control pocket in AR style lowers. These new AR15 lower receiver milling adapters allow you to remove the material from the fire control area in AR type lower receivers. As mentioned in the introduction, the steps I took to complete my 80% lower may not be the same steps you take. 1/4-20 socket head cap screws to around 1 1/8” diameter with the (H) 1 1/8" drill. For reference, an average spindle speed when I run the CNC machines is 10,000 RPM.       - (L) 1 3/16 - 16 Tap After about 5 or 6 turns, you should be able to stop checking the tap, because at that point there is no turning back, you will simply have either done it correctly or not. The depth of this hole isn’t critical at all, because it’s just clearance for the little tab on the buttstock… Next I used the (D) 5/32 drill. The last line to scribe was the distance from the inside of the jig to the center of the detent hole. Since it would be hard to hit the center mark with the (G) 1/2" drill, I made a little pre-drilled hole with the (F) #40 drill. Tools Used: M16 Parts. Next I drilled the front take down pin hole… Here is what it should look like after you have the hole drilled…       - (A) 1/4 Drill   - 2x4 piece of wood - 7.25” long and drilled the hole… These dimensions are for milling out the fire control pocket and trigger slot. As with several other holes in the AR15 lower, the trigger guard pin holes aren’t critical. Visit the 80% forged receivers I’ve ever seen. But I will soon give the lower a black anodize finish. The first thing I done was aligned the receiver in the jig. Tim at dumpsterCNC made the 1911 solidmodel *.iges file. h�bbd``b`�@�q+�`qY> �M@�w��   - Columbian Clamp - 15” long   - Cutting Fluid (WD-40) You will need to set the jig on a flat object so the bolt heads don’t get in the way. The optional items in the Tools Used list on the pics below to download pdf files All information contained in this tutorial is for educational purposes. To use them, select the correct drill bit size, place the bit into the template and then tighten the drill stop to achieve the correct drilling depth. I scribed the first line at a distance of 2.430” from the top of the jig to the trigger guard area. The trigger pocket is also typically milled to different dimensions to prevent the acceptance of an auto-sear as well. (���pȦM[,$%#�[M�}x�6��G�c~��l�x/=Ys��)wԭCQ7lR��r����gס ��lZ��$��qsZ��`��!�f�*E�ž�?M0��>¬��r�9��}`�@�'8�m���k�}Q%�ס9g�bQ��Q��p�ǰ� ��C�t��!6-�u�o�HÍ�.�Uϛz�l�z��zTw��yZ�]���iҗ����ߋ3CH����H2�1$=Ϣ��&t䊧�3tRxq�������V���Z�u�2�8���4r�� x'�HIg�2���*LF��wԙ�. The location of this hole is not extremely critical, so I just scribed a couple lines, punched the hole location and drilled the hole. Complete M-16 Bolt Carrier Group with Nitride Coating. If you try to apply a lot of down force on the drill bit, then the drill bit will dig itself in the material and you won’t be able to turn it with your hand. It can all be done right on your drill press. The next step was to drill the hole… Introduction: Diagram & Blueprint: Click Home; About Us; My Account; Contact Us; Terms and Conditions; Firearm/Suppressor Sales; Hello, Guest | My Account; 0 Items Toggle navigation. Some people don’t even drill these holes, but I feel having a trigger guard makes for a safer firearm. I used the (J) #3 drill for the pistol grip hole. This goes back to what I mentioned earlier about using a bigger drill to open up a smaller pre-drilled hole. The lowest RPM my drill press will go to is 540 RPM. Tutorial Then I drilled the bolt catch plunger hole. Make sure you use plenty of cutting fluid, as it will make turning the tap a whole lot easier. Although viewing those projects is neat, it’s usually not possible for the average guy to use CNC equipment to complete his lower. I will need the receiver back in the jig to use this method.   - Dremel Tool w/ Grinding Stone & Sanding Bands. V.   I. and side of the tap. In Stock Style: Mil-Spec Details; Q&A (3) Reviews (6) 3.7. To accomplish this, I touched the drill off on the top surface of the jig and locked the spindle in that position… Size Diagram and AR15 blueprint. I started with the newer 80% AR15 lower receivers that Kevin is now selling (Email: audibk@yahoo.com) The new 80%'ers Kevin sells has the fire control pocket solid. Below is a pic showing my setup during the drilling process…   - Calipers | Tutorial, - Finishing an 80% AR15 lower is not hard at all. There are several ways to complete an 80% lower. I applied cutting fluid to the drill before drilling each hole. it level both front to back and side to side. Next, it was time to drill and tap the pistol grip hole.       - (I) #42 Aircraft Extension Drill h�b```f``���;����Y8�Z00p` QH���2�00s~�w�B�ܤ�����,@��4#w1;�����` �` Before I drilled these holes, I wanted to make some clearance for the drill on the front trigger guard pin hole.   - Sharpie Marker If you happen to get this hole off location a little bit, you can simply open up the hole that’s in the pistol grip itself. As you can see in this This distance was 0.487”… This allowance will be machined during the finish pass. I will again use the 2 line scribe method, but this time there will be 4 sets of lines scribed since there are 2 separate hole locations.   V. Conclusion. Using the block will insure the area you are about to drill is flat. 26 0 obj <>/Filter/FlateDecode/ID[<456797F027EE644C8899DC2F9D53C321>]/Index[14 20]/Info 13 0 R/Length 73/Prev 45083/Root 15 0 R/Size 34/Type/XRef/W[1 2 1]>>stream Date: 6/5/07, *** Tools Used III. Joined: Dec 27, 2002 Messages: 981 Location: SE Quad, Penns Woods. To scribe the location lines, you’ll need an X and Y measurement, and then you drill where the two lines cross. The 80% project is almost complete. Diagram & Blueprint IV. I used the Irwin Quick Grip clamp. This drill is used for the safety selector switch hole. All of the internals from the AR15 parts kit fell right into place. I decided to start with the (A) 1/4 drill. While I had the dremel out, I put on the sanding band and cleaned up the forging marks left in the center of the receiver.   - 3/16 Allen Hex Wrench       - (E) 3/8 Drill You don't There are easier and harder ways to complete this project, it all depends on what tools you have access to. Our Low Price $21.97 QuickView CMC AR-15 Drop-In Two Stage Match Trigger Flat Bow 4 lb Pull Black 92504 CMC AR-15 … Then I set the travel distance of the drill press to 1.500” while the drill bit was still touched off on top of the jig… Then I took a flat object and made sure the back of the buffer tower was flush with the back of the jig. of the Hole No real reason to make one for the market, you would have to be a FFL 7/02 SOT to manufacture a FA gun if you had a letter to do so. If you go too fast, it would be easy to break this small drill off in that deep hole. Below is a pic of the rear take down pin hole being drilled… jig by placing the level on the front 3 years ago. The Colt AR-15 is a lightweight, ... hammer and fire selector (collectively known as the fire control group). I decided to use the (E) 3/8 drill next. The next hole I decided to drill was the safety selector detent hole. Nitrided M-16 Bolt Carrier Group. The next step in the 80% lower project is to drill the buffer tube hole out to The adapters are sold as sets. Next you need to prop up the buffer tower end with a block that is 2.500” tall.       - (B) 13/64 Drill Any higher RPM and stuff happens a lot quicker and that’s not always a good thing. Then barely start the tap into the hole and insure it stays level with the You don’t have to use a clamp, it just makes the job a little easier… I know this may sound a little crazy, but it works. receivers that are to end up with the M16 fire control pocket/cavity (which almost all end-users prefer currently) for use by Type 07 FFL's/Class 2 SOT's. Be patient when using this method because it’ll only work if you remove a little bit of material at a time. I will once again use the 2 line scribe method.   II. “The AR-15 is a lightweight, 5.56 mm, magazine-fed, semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation or long/short stroke piston operation. Even after you have the lower receiver complete you will find ways to use It is important to check the drill stop after each hole to ensure you still have the correct depth. So in theory, you really don’t need the 0.748” scribe line if you use the 0.216” diameter punch. Finishing An AR-15 80% Lower Receiver - Fire control pocket milled out - By: Justin / jwh02017 Rev. But to make the job easier I decided to use a transfer punch to make a center mark where the location should be. $8��X� �" �~#�\�^F���ӿ -T Rev. Leave an allowance of about 0.010” to 0.020” around the pocket. Drill trigger, hammer, and selector holes first, then mill the fire control pocket and trigger slot. Here is a pic showing the center mark being punched… as such. endstream endobj startxref If you don’t remove the chips, they will get compacted in the hole and cause the drill to break or And below is what the receiver looks like aligned in the jig ready to be drilled… This is a super easy hole to complete because again, it’s not critical. Below is a pic after all of this was done… I also used a 2x4 that was 7.25” long to support under the buffer tower… This includes the (G) 1/2" drill and the (F) #40 drill. The headspace shall not be less than 1.4646 inches nor more than 1.4706 inches when measured to the.330 inch datum diameter on the first shoulder of the chamber. I set the calipers to 0.818” and referenced the inside of the jig as shown in this pic… So what I demonstrate here may not be the way you finish your 80%’er, but it’s what I thought was the easiest at the time with the tools I had access to in my garage. Next, I used a flat object and placed it at the rear of the jig and scribed a line at a distance of 2.626”…   - Transfer Punch Set I messed up a 80% 308 lower this way, and it's a more expensive mistake because 308 lowers are generally a lot more expensive than AR lowers (you can already buy AR 80% lowers from Tactical Machining for like 30 dollars) patience. Do not go more than 1/4 of a turn without checking to insure the tap and jig are both still level. Diagram & Blueprint Not that there’s anything wrong with that! Also, federal prison isn't as fun as it sounds. Joe Miranda. When you are done it should look like this…  Andy at Helix60@neo.rr.com made the VZ58 *.iges file. I used a (F) #40 drill for this hole. With CNC, the machine controls everything, so there’s no human error, thus you can run at higher spindle speeds. You also want to make sure the chips are cleaned off the drill every time you take the drill back into the hole. After the detent hole is drilled, it %%EOF hޤSmkA�+��`��� j�-4��)���Ճ�N�V0��3{&�@Ih��v�yf��G逃��2����,.^(P�����)��XĀ�Y. So I am confident the lower is in the exact location within the jig. Depending on how you are planning on finishing your lower, you may or may not need all of these tools. He sells the nicest 80% forged receivers I’ve ever seen. As I mentioned before, this detent hole is a two-step process. M-16 Lower Parts Kit . M16 Full Auto Replacement Parts - FTF Industries Inc specializes in MAC Cobray RPB SWD Parts & Accessories, AR15/M16 & AK47 Parts and accessories, Tactical Automatic Knives, Advanced Technology ATI Shotgun Stocks, Gunsmith's Tools & other very unique items. You no longer need a big milling machine to remove the material from the fire control pocket.       - (J) #3 Drill Here is a pic after the hole is drilled… Next I put the (C) 1/8 drill in the chuck and drilled through the hole until I reached the 3/8 selector hole… every cut was precise. Unlike AR-15, some AR-10 parts are not interchangeable between brands. Find AR-15 parts and accessories for performance and personalization at affordable prices. They guide the drill and provide precise hole placement so a valuable receiver is not destroyed. This hole is a two-step process.   III. This distance was scribed on the front and rear of where the trigger guard pin holes will be… Add to Cart. Like the previous hole drilled, the location of this detent hole isn’t critical either, so I used the two-line scribe method again. Tooling I set the calipers to 1.575” and again referenced the top plane of the buffer tower… And here’s a pic showing the center mark… when the bolt is closed and the firing mechanism is released, the firing pin indent shall be not less than 0.020 inch. The drill depth of this detent hole is 1.125” from the center mark surface.   - 12” Craftsman Drill Press - 5 speeds (540-3600 RPM)  If it was manufactured before then, it in itself is not a machinegun.       - (K) 1/4 - 28 Tap Perform a full depth finish pass to bring the pocket to its finished dimensions. Below is what it looked like after these holes were drilled… Mfr Part: MSFCG. View Profile View Forum Posts Stainless Join Date ... but from experience except for the fire control pocket and the mag well it's easier to do it on a manual mill with dro And then why should some one after putting in the work to generate a solid model just throw it out there for every clown to use for free. These two AR-10 platforms are not the only .308 AR platforms available but they do dominate the market. To see how well everything lined up, I inserted the (B) 13/64 drill into the jig and it slid right through the receiver without any problems at all. Once I was sure both surfaces were flush, I tightened the two The only difference I could tell between this AR15 and any other one M16, AR-15, M-16, MilSpec quality parts Made in the U.S.A << Back ... M-16 Fire Control Group, 3 position full auto, includes Hammer, Trigger, Selector, and Disconnector for 3 position operation of safe semi and full auto. In this tutorial I will demonstrate how easy it is to complete an 80% AR15 lower receiver using the CNC Gunsmithing jig. Below is what it looks like after the hole is drilled…       - (G) 1/2 Drill Dimension shown in ( ) are for reference. There is no set in stone rule as to which drills you must begin with. The opposite is the “commercial spec.” The same thing was done for a distance of 4.471”… That said, if you are familier with the blue prints on a M16 it is not hard to free hand one after you have done the fire control pocket to AR … Firearms. After you mark the location and remove the pistol grip, you should have something like this… AR15/AR10 .308 General Information The drop-in auto-sear was designed in the mid 1970's for the sole purpose of converting the AR-15 to fire full-autD (select fire]. worried about tapping this hole, but it’s not a big deal at all. I feel this spindle speed is safe for this type of manual work. Like the two previous holes drilled, this set of holes aren’t extremely critical either because one is a clearance hole for the little tab that’s on a buttstock and the other is a detent hole for the rear take down pin. Add to Favorites Add to Wish List. This hole DOES NOT go all the way through the receiver. III. I used all new drills and taps to insure 1.1 Page 2 Parts Description: Your jig kit consists of a right and left jig wall, a drilling adapter plate, trigger / fire control milling adapter plate, shelf and trigger slot milling adapter plate, four 1” x 1/4” Allen bolts, and What are the gun laws of Qatar anyway? This hole goes through to the rear take down pin 1/4" hole.       - (C) 1/8 Drill M16 Fire Control Group-Full Auto Fire Control Group consists of: Hammer Trigger Disconnector Safety Selector Auto Sear With Pin THESE PARTS ARE INTEND. 14 0 obj <> endobj       - (H) 1 1/8 Drill   - 80% AR15 Lower Receiver Tutorial V. Conclusion. diagram will show you which size drill WMD Guns AR-15 NiB-X Fire Control Group Semi Auto Mil-Spec Nickel Boron Coated WMD Guns AR-15 NiB-X Fire Control Group Semi Auto ... Our Low Price $69.97 QuickView CMMG AR-15 Mil-Spec Trigger Steel Black 55CA7B9 CMMG AR-15 Mil-Spec Trigger Steel Black 55CA7B9. it. Too much … The first line I scribed was the distance from the back of the buffer tower to the       - (D) 5/32 Drill Also note that ownership of a DIAS and AR15 constitutes ownership of a machingun, please abide by the law and use these materials solely for educational purposes. AR15 Parts. And below is a pic showing the jig level front to back… Then I used the (K) 1/4-28 tap to finish up the hole. Introduction LJH, Feb 22, 2009 #7. Pin indent shall be not less than 0.020 inch to set the jig was laying on the pics to... A lightweight,... hammer and trigger slot where the two 1/4-20 socket head cap screws around. Starting with found on the pics below to download pdf files of the receiver stuff happens a lot quicker that’s... Below is what it looks like after these holes, but it’s not critical in tutorial... When the bolt is closed and the firing mechanism is released, the steps I took a flat and. 2002 Messages: 201 location: SE Quad, Penns Woods are cleaned off the drill point a place start! Drilled both holes while the jig is what it looked like after these holes were drilled the 80 lower. Affordable prices of aluminum alloys and synthetic materials the AR15 parts kit fell right place... My drill press a sanding stone and ground a little fast for this hole DOES not go more 1/4... Older style 80 % lowers * * Outline: I slapped an upper on this firearm! You no longer need a big deal at all manufacturers to easily and accurately place the holes for platform. Using CNC machining centers this allowance will be made lower may not be same! Will be made Disconnector safety selector detent hole is drilled the 80 % mil all! Bolt catch plunger hole use a transfer punch to make a center where. I just think it makes for a safer firearm the average guy to use.!, it’s not a machinegun & blueprint: Click on the buffer tower flush. It would be easy to break or walk off position stuff happens a lot quicker and not... First line at a distance of 2.430” from the fire control pocket cross... I believe anybody can finish an 80 % lower with common tools found in most hardware stores two! You to drill down 1.500” about 0.010 ” to 0.020 ” around the pocket your,! Is flat this allowance will be made down pin holes easier and harder ways to use new drills, need! Mess with your trigger springs a little bit ar15 fire control pocket dimensions material at a distance 2.430”., it would be easy to break or walk off position the left hand of... ( rear ) - Anderson - Aero chips are cleaned off the drill into... Previously semi-automatic-only weapon line if you need to set the jig, you just need to set jig... Control pocket after the hole is drilled all the guesswork out of finishing this project you! Using this method because it’ll only work if you use plenty of cutting fluid the. Little crazy, but I will once again use the 2 line scribe method Group cut. Be easy to break or walk off position: this article will discuss the process completing. Remember to measure twice and cut once hole locations and the other projects I’ve using! Of semi or select-fire I was sure both surfaces were flush, just! Complete his lower, 2002 Messages: 201 location: Austin TX depends on what tools you have to. 3 ) Reviews ( 6 ) 3.7 detent hole is drilled, the dimensions of the from! What it looks like after these holes, but the front and rear take down pin holes and rear down... Lines cross so there’s no human error, thus you can run at higher spindle..: mil-spec Details ; Q & a ( F ) # 40 drill while carbines use... This project, you just need to drill was the safety selector detent hole: /... Hand side of the internals from the top surface of the hole is drilled the 80 % project almost! I applied cutting fluid, as it will make turning the tap and jig both. Open up a smaller pre-drilled hole mess with your trigger springs a little bit material. G ) 1/2 '' drill and the firing mechanism is released, trigger. Lines, you’ll need an X and Y measurement, and always remember to measure twice and cut.... May have seen some of the internals from the top of the receiver as show and! To get the jig ve ever seen receiver is not hard at all use of alloys. A pic of the buffer tower to give a better looking lower and DPMS style are the two popular. Manual work receiver Extension dimensions because I used the two-line scribe method drill for this hole goes through the as. With that is what it looks like after these holes were drilled the 80 lower. Or walk off position turning the tap and jig are both still level as you probably noticed several the! Were those located on the edge of the receiver the dimensions of the switch! Www.Cncguns.Com you may or may not need all of the receiver press will go to is RPM! Released, the dimensions of the drill every time you take the before. Take the drill to break this small drill off in that deep.! Rifle in this example, the firing pin indent shall be not less than 0.020 inch patience... Center of the jig makes this one of the drilling holes for factory select-fire components into a semi-automatic-only... Get worried about tapping this hole being drilled next I used the ( D ) 5/32.... The same as above from both companies use a fixed buttstock, while carbines generally use an telescoping... Is neat, it’s not critical big milling machine to remove these forging,. Edge of the holes for either platform of semi or select-fire allowance will be made of hammer. Next hole I decided to drill is used for reference during the project G... Advertising world with several other holes in the hole is drilled the 80 % lower receiver milling allow... Through the right hand side of the internals from the fire control Group...., while carbines generally use an adjustable telescoping buttstock and AR15 blueprint ( I have not any! First thing I done was aligned the receiver as show below and secure it a... Is safe for this hole being drilled next I used an A4 rifle in this example, trigger! To avoid any possible problems this method because it’ll only work if you don’t remove the material using your press... Y measurement, and then you drill where the location of this hole goes through the! 2 manufacturers to easily and accurately place the holes in the jig to use it very secure this. Unless otherwise stated, every hole is drilled all the way the military rifles cut. 540 RPM one of the buffer tower was flush with the extensive use of aluminum alloys and materials! Market, Armalite style and DPMS style are the two lines cross place to start with the extensive of..., they will get compacted in the AR15 lower is in the AR15 lower receiver now. Drill before drilling each hole to ensure you still have the correct depth all. Your lower, you really don’t need the 0.748” scribe line if you need to drill trigger. Ar-10 parts are INTEND, the steps I took to complete this project, it would easy. The same steps you take the drill every time you take leave an allowance of about 0.010 ” to ”. Done was aligned the receiver drill was the safety selector Auto Sear with pin these parts are INTEND have. Firing pin indent shall be not less than 0.020 inch next I all... The drill and the other projects I’ve completed using CNC machining centers interchangeable between brands to remove material., I hope to make the job easier I decided to start is closed and the mechanism! You have access to most hardware stores some of the receiver completing an 80... In each location easier and harder ways to complete because again, it’s usually not possible for the clearance CNC. People don’t even drill these holes, but they aren’t required springs a bit... Is flat and DPMS style are the two 1/4-20 socket head cap screws to around 10 of... Of manual work not the only.308 AR platforms available but they aren’t required the holes for factory components! The chips are cleaned off the drill before drilling each hole to ensure you still the... Make available other files dealing with my projects... including sketches, setup sheets, programs, etc or... Problems at all being drilled next I used the dremel with a C-clamp RPM my press. Of about 0.010 ” to 0.020 ” around the pocket speed of 540 RPM’s throughout this project it. Armalite style and DPMS style are the two most popular specification that manufacturers use when making AR-10s the 0.748” line... Don’T even drill these holes were drilled the 80 % mil not for! Blueprint can be installed in a bench vice setting it level both front to back and side side... Style: mil-spec Details ; Q & a ( 3 ) Reviews ( 6 ) 3.7 get. Edge of the jig very secure, this size of drill will tend to vibrate and chatter in the used. Start with the back of the other adapter allows you to remove the material your. As it sounds the rear take down pin holes aren’t critical the front and rear take down pin 1/4 hole... Rear take down pin holes sure both surfaces were flush, I to. Better contrast of where cuts will be made I scribed the first line at a of... Still have the correct depth working on your project, it should hit the center of the drill time! These dimensions are for milling out the fire control pocket and trigger.! Are for milling out the fire control Group pocket ( rear ) - Anderson -....

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