To accomplish this, I touched the drill off on the top surface of the jig and locked the spindle in that position… These new AR15 lower receiver milling adapters allow you to remove the material from the fire control area in AR type lower receivers. Simply slap jig on the receiver as show below and secure it with a C-clamp. I scribed a line that was 0.748” from the left side of the receiver to the hole location… Optics. Joined: Dec 27, 2002 Messages: 981 Location: SE Quad, Penns Woods. M16 Fire Control Group-Full Auto Fire Control Group consists of: Hammer Trigger Disconnector Safety Selector Auto Sear With Pin THESE PARTS ARE INTEND. style 80% lowers ***, Outline: As you probably noticed several of the holes in the AR15 lower receiver are not critical at all. Tutorial: I started with an 80% AR15 lower receiver from Kevin (Email: %PDF-1.5 %���� Later on, I hope to make available other files dealing with my projects...including sketches, setup sheets, programs, etc. Drill trigger, hammer, and selector holes first, then mill the fire control pocket and trigger slot. Next, it was time to drill and tap the pistol grip hole. Full-sized rifles use a fixed buttstock, while carbines generally use an adjustable telescoping buttstock. Firearms. III.   - Dremel Tool w/ Grinding Stone & Sanding Bands. Once I was sure both surfaces were flush, I tightened the two You also want to make sure the chips are cleaned off the drill every time you take the drill back into the hole. 1 1/8” diameter with the (H) 1 1/8" drill. 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… AR15 Lower Receiver Blueprint PDF DOWNLOAD. 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. Although viewing those projects is neat, it’s usually not possible for the average guy to use CNC equipment to complete his lower. spec. Like the previous hole drilled, the location of this detent hole isn’t critical either, so I used the two-line scribe method again. M-16 Lower Parts Kit . This hole DOES NOT go all the way through the receiver. The blueprint can be used for reference h�bbd``b`�@�q+�`qY> �M@�w�� The only difference I could tell between this AR15 and any other one Here’s a pic showing that…  So I am confident the lower is in the exact location within the jig. I used the dremel with a sanding stone and ground a little indention for the clearance. From the top surface of the jig, you need to drill down 1.500”. Finishing An AR-15 80% Lower Receiver - Fire control pocket milled out - By: Justin / jwh02017 Rev. when the bolt is closed and the firing mechanism is released, the firing pin indent shall be not less than 0.020 inch. The pic below shows the pistol grip on the lower ready to have the hole location marked… The Colt AR-15 is a lightweight, ... hammer and fire selector (collectively known as the fire control group). %%EOF   - 2x4 piece of wood - 2.50” tall audibk@yahoo.com) He sells the nicest 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. AR-15 carbine receiver extensions should be 1.14″ in diameter, also known as “mil-spec” in the advertising world. Visually rough out the large pocket of the fire control pocket, but not the rear slot, to a depth of 1.250”. In today's market, Armalite style and DPMS style are the two most popular specification that manufacturers use when making AR-10s. starting the 1/2" drill more forgiving… I put the (I) #42 aircraft extension drill in my cordless drill and drilled through both ears of the bolt catch area. AR15 to M16 Class 2 Drilling and Check Fixtures. You no longer need a big milling machine to remove the material from the fire control pocket. and side of the tap. All of the internals from the AR15 parts kit fell right into place. 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… Add to Favorites Add to Wish List.       - (B) 13/64 Drill 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. 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. As with several other holes in the AR15 lower, the trigger guard pin holes aren’t critical. As I mentioned before, this detent hole is a two-step process. Below is what it looked like after these holes were drilled…   - CNC Gunsmithing Drill Jig 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”… 14 0 obj <> endobj AR15/AR10 .308 General Information 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. 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. Introduction: V. With a little patients anybody can do it. The lowest RPM my drill press will go to is 540 RPM. I set the calipers to 0.818” and referenced the inside of the jig as shown in this pic…   - Drills & Taps: The 80% AR15 lower receiver is now 100% complete firearm. 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. 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. 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. Next I drilled the front take down pin hole… Leave an allowance of about 0.010” to 0.020” around the pocket. For Class 2 manufacturers to easily and accurately place the holes for factory select-fire components into a previously semi-automatic-only weapon. Size Diagram and AR15 blueprint. So in theory, you really don’t need the 0.748” scribe line if you use the 0.216” diameter punch. Below is a pic of this hole being drilled… 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 patience. I decided to start with the (A) 1/4 drill. The 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. The optional items in the Tools Used list 3 years ago. 1/4-20 socket head cap screws to around worried about tapping this hole, but it’s not a big deal at all. 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. To better support the jig and receiver, I used a Columbian Clamp. I then used a center punch to mark the locations of the two holes… Not that there’s anything wrong with that! The next set of holes I drilled were those located on the buffer tower. All information contained in this tutorial is for educational purposes. 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. After a few turns of the tap, you should have something that looks like this… So with the (D) 5/32 drill in the chuck, I locked in the spindle with the drill touching the center mark… And below is a pic showing the jig level front to back… Pretty much the same as above from both companies. To do this I turned the jig upside-down and set it on the edge of the drill press table. best case scenario, it works. Below is a pic of the drills & taps I used. The depth of this hole isn’t critical at all, because it’s just clearance for the little tab on the buttstock… 12. Finishing an 80% AR15 lower is not hard at all.   - 2x4 piece of wood - 7.25” long jig by placing the level on the front I decided to use the (E) 3/8 drill next. 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. It is manufactured with the extensive use of aluminum alloys and synthetic materials. After the detent hole is drilled, it 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. If you don’t remove the chips, they will get compacted in the hole and cause the drill to break or The next step was to drill the hole… (I have not verified any dimensions) 11-30-2015, 07:45 PM #4. The last line to scribe was the distance from the inside of the jig to the center of the detent hole. worst case scenario it will mess with your trigger springs a little bit. Tools Used III. below are items that make the job easier, but they aren’t required. The CNC jig takes all the guesswork out of finishing this project. Doing this will make It can all be done right on your drill press. This hole goes through to the rear take down pin 1/4" hole. 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)   - Transfer Punch Set Date: 6/5/07, *** There are only two small operations which would make an ar lower select fire capable. The AR-15 was first built by ArmaLite as a selective fire rifle Also, federal prison isn't as fun as it sounds. AR Build 00023 To control the depth of the holes, Modulus Arms includes a drill stop and a template. There are easier and harder ways to complete this project, it all depends on what tools you have access to. 80% forged receivers I’ve ever seen. Do not go more than 1/4 of a turn without checking to insure the tap and jig are both still level. 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. I. You don’t have to remove these forging marks, I just think it makes for a better looking lower. avoid any possible problems. Visit the       - (A) 1/4 Drill during the project. This hole is a two-step process. The location of this hole is not extremely critical, so I just scribed a couple lines, punched the hole location and drilled the hole. AR-15 Fire Control Group Laser Cut Disconnector. 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 … 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. Lower Parts Kit M16.   - 80% AR15 Lower Receiver Too much … I drilled both holes while the jig was laying on the left hand side of the receiver. But I will soon give the lower a black anodize finish. 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.   IV. 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. Any higher RPM and stuff happens a lot quicker and that’s not always a good thing. 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. endstream endobj startxref I used the (J) #3 drill for the pistol grip hole. of the Hole The opposite is the “commercial spec.”       - (G) 1/2 Drill This drill is used for the front and rear take down pin holes. They guide the drill and provide precise hole placement so a valuable receiver is not destroyed. Add to Cart. 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. Unless otherwise stated, every hole is drilled all the way through the receiver. 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. The BATFE have ruled that no M16 auto or burst parts can be installed in a non-NFA registered lower. In Stock Style: Mil-Spec Details; Q&A (3) Reviews (6) 3.7. Again I locked the spindle in with the (F) #40 drill touching the center marked surface and set the drill depth to 1.125”… More details. Mfr Part: 709100021520. He sells the nicest 80% forged receivers I’ve ever seen. endstream endobj 15 0 obj <> endobj 16 0 obj <> endobj 17 0 obj <>stream Date: 6/5/07 *** NOTE: This tutorial uses Kevin's older style 80% lowers *** Outline: I. Then I drilled the bolt catch plunger hole. However, this is not a rule. Be patient when using this method because it’ll only work if you remove a little bit of material at a time.   - 3/16 Allen Hex Wrench 33 0 obj <>stream “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. LJH Member. Introduction II. This is a super easy hole to complete because again, it’s not critical. The last step is to drill the trigger guard pin holes. www.cncguns.com You may have seen some of the other projects I’ve completed using CNC machining centers. And below is a pic showing the completed safety selector detent hole drilled… 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.

ar15 fire control pocket dimensions

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