When the opening is the same size as the template turn off the router, wait for it to completely stop and remove it. The Modulus Arms Universal AR-15 80% Lower Receiver Jig contains the following parts: 1. AR15/AR10 .308 General Information However, .223 chambers are slightly more accurate due to the tighter specs. 5.0. 5.0. 1x Rear Support 6. Blackout Defense Zero Trigger. Nowadays, there's a trigger out there for every type of shooter and budget. Move to the location of the pivot pin (7.500X -.250Y) and zero your DRO. When you're done, remove the Pocket Drilling Block #03 and use a shop-vac to clean the jig and lower of chips. 227-GTARP | Guntec. Visually rough out the large pocket of the fire control pocket, but not the rear slot, to a depth of 1.250". pretty sure theyre the same. See Figure 8. The Impact AR Trigger for AR-15 with Solid Trigger Face Straight 3 LB. Completing an AR build is a popular hobby in the shooting world. 2. The second trigger would allow the trigger to pull, but the disconnect engages after the first shot and the trigger . Geissele Super Dynamic 3 Gun. STEP 6 Prepare to mill the trigger pocket by placing the Template Spacer #04 with the notched end towards the receiver extension hole (buffer tube hole). Open sides of jig offer plenty of room to make adjusts to the trigger assembly without having to take it in and out of the rifle. Drill J #3 Drill K 1/4 - 28 Tap L 1 3/16 - 16 Tap. Jig can be mounted in a vise or on a pistol grip. Then chuck a 5/16 end mill and mill the slot through using the same center locations. Finishing one of these receivers on my Grizzly Mill/Drill was not a big chore. APPLICABLE DOCUMENTS 2.1 Government documents. We've never experienced any issues with the recommended Stag Arms Lower Parts Kit and feel confident . For AR-15/AR-9 use the back-most holes. Carbine - The carbine length gas tube is used with AR-15's that utilize 16" barrels and 14.5" with attachments that bring the barrel length to 16". This article will discuss the actual milling process of an 80% lower as well as some tricks, tips, pitfalls and general observations in finishing an 80% Ar-15 lower receiver. Move to the location of the pivot pin (7.500X -.250Y) and zero your DRO. 1x Rear Take Down Bolt [1/4-20 x 2.25"] 11. AR15/M16 FAQs: Bushmaster Armpistol: M96 Expeditionary: ANM2: HAC-7 . Single-Stage Trigger. AR-15 Complete Anti-Rotation Trigger / Hammer Pin Set. At least, that's what the lore says. Now do the same for the take-down pin hole at 6.375-0.000. Drop-In AR-15 Triggers It's not a looker from the outside with its sheet-metal-esque enclosurebut the trigger had a consistent 2.1-pound trigger pull and a clean break. Today in part five of our DIY AR-15 Build you'll learn how to install the Trigger Group in your Lower Receiver. The trigger shall hold the hammer in the This allowance will be machined during the finish pass. When I had my 5D-Tactical pro jig, it would do AR 10,15, and 9 with the same trigger pocket. Plastic block permits dry firing the assembly and won't damage the hammer or jig. PHONE: (386) 682-3885 Align the drill guide under the rear pocket and trigger slot cutouts in the template. Title: Setup Block Drill Guide Author: DELL\Justin (DELL) Created Date: Did confirm the spring is installed. Jig interior is machined to the exact dimensions of the AR-15 fire control pocket. The Impact AR Trigger for AR-15 with Solid Trigger Face Straight 3 LB. In Stock. Drill and ream 0.376 dia through at 5.572-0.464. 078-IMPACTARST | Timney. Block holes. It allows tolerance for cheap surplus ammunition. Dimension shown in ( ) are for reference. Check your measurements. More over-travel means trigger reset takes longer. Leave an allowance of about 0.010" to 0.020" around the pocket. Unless specified, +/- .015 tolerance should be . Refer to the drawing "DRIVER SIDE" in the appendix for dimensions for this . Leave an allowance of about 0.010" to 0.020" around the pocket. Center line of take-down pin hole Left side face Zero Z axis this face Trigger slot 5/16 end mill (R.156) Fire control . MILSPEC Document for M16 Variants . This allowance will be machined during the finish pass. 12. When the trigger is released, the discomect shall allow the hammer to return to the normal cocked position. These dimensions are for milling out the fire control pocket and trigger slot. 1x Template 2. Set your endmill to stop on the deck. Fire control pocket All dimensions and tolerances are mil-spec, except for reference dimensions. Ensure your lower and jig are still seated vertically and leveled using a bubble level. DIY AR-15 Build: Buttstock Installation. For .308/AR-10 use the front-most holes. Drill trigger, hammer, and selector holes first, then mill the fire control pocket and trigger slot. CMC triggers were one of the first drop-in triggers availableand now they have Single Stage 2.5 lb ($168) flavors in addition to the original 3.5-pound version. . 12. M4A1 - Carbine, 5.56 mm: MIL-C-71186 (AR) M16A2 - Rifle, 5.56 mm: MIL-R-63997B (AR) Last Modified on March 4. As other people have said, it's the same size pocket. Lucky Gunner did a great study in 2012 looking at the truth to all of this. Drill and ream .251 dia. Route out the trigger slot using the routing pocket as a guide. 1x Buffer Support 7. Dimension shown in ( ) are for reference. trigger slot. Zero creep, clean break. AR-15 lower receiver blueprints are readily available online, and my main concern was calculating the dimensions from the drawings correctly. Drilling that third hole is what legally changes your AR-15 from a . Rated 5.0 out of 5 stars. The first step in the process is drilling the hammer pin, trigger pin and selector holes. 078-IMPACTARST | Timney. 2x Side Plate . 14x Screws [8-32 x "] 9. Now to start cutting, taking light passes both wider and deeper, to provide a smooth, accurate cut. The optional items in the Tools Used list below are items that make the job easier, but they aren't required. Dimensions for easy manufacturing and measurement, not mil-spec. 3.3.2.7 Triqqer. Rotate the Trigger Slot Top Plate so that the routing pocket is above the drilled holes. Next thing is to set the depth to zero when the mill contacts the top surface. This must be done with each/any cutter change and gives us a reference point to measure down from. Drill two 1/4" holes through as shown. AR Lower Receiver Step-by-Step Chapter 3 15 Next is the hole for the safety selector. The holes for the selector (3/8") and trigger and hammer pins (5/32") were drilled first and they must be precisely positioned for proper function of the fire control group. The trigger pocket is also typically milled to different dimensions to prevent the acceptance of an auto-sear as well. The opposite is the "commercial spec." I don't see commercial extensions very often anymore, and I think the industry has more or less settled on the "mil-spec" tube. These dimensions are for milling out the fire control pocket and trigger slot. Move the cutter around the pocket in a clockwise direction (conventional milling direction). Watch your depth! See Figure 6. Quality Made in America Parts to Build or customize your AR-15 Complete AR15 Rifle Kits - AR-15 80% Lowers - 80% Lower Jigs - Rifle Kits and More ADDRESS: 918 Carswell Ave, Holly Hill, Fl. - 80% AR15 Lower Receiver from Kevin (with solid fire control pocket) - 12" Craftsman Drill Press - 5 speeds (540-3600 RPM) - Drills & Taps: - (C) 1/8 Drill. DIY AR Build Part I: 8 Steps to Machining an 80-Percent Lower. Step 3: Cut the fire control cavity. 0.0 0.0 6.375 0.0 0.0 5.572 0.464 $204 at Blackout Defense Jump to Details. 17. . Rated 5.0 out of 5 stars. This specification covers the requirements, examinations and tests for a 5.56mm lightweight, air-cooled, gas operated, magazine-fed carbine designed for either full automatic or semi-automatic fire (see 6.1). The bolt catch slot is completed. 227-GTARP | Guntec. 14 AR Lower Receiver Step-by-Step Chapter 3 Location: Pick up the surface just indicated (butt face) with an edge finder and then the face of the forging that is against the angle plate (deck). 2x Side Plate 3. A Archilochus Rating - 100% 17 0 0 Joined Nov 19, 2008 Messages 961 Likes 330 Location South NH & Western MA Jan 8, 2016 #5/31 However, this is not a rule. The semi-auto function of the AR-15 is relatively simple, and it's allowed aftermarket trigger kits to flourish. 2.1.1 Specifications, standards and handbooks. the pivot pin hole through at 0.000-0.000. Router (w/ 1/4" collett) Drill (Hand or Drill Press) Table Vise or 2 Table Clamps 1/8" Allen Wrench (for template bolts) 3/16" Allen Wrench (for jig bolts) 3/32" Allen Wrench (for stop collar on drill bit) Cutting fluid such as Tap Magic, Relton A9, Oatey Dark Cutting Oil mineral oil, or motor oil. FWIW: AR9 BCGs (and there are so many proprietary designs) might play differently with non-milspec triggers, but otherwise should be the same. Norcross says finishing an 80% receiver is not a challenging job, but care must be taken to properly position the drilled holes. $94 at Brownells Jump to Details. AR15 Lower Receiver Blueprint PDF DOWNLOAD. 1x Template 2. pretty sure theyre the same. AR15 Lower Receiver Blueprint PDF DOWNLOAD. AR-15 XXXXXX PROJECT: A 1/1 OF 2 SCALE: SHEET: REV: INTERPRET GEOMETRIC TOLERANCING DESCRIPTION PROPRIETARY . The Modulus Arms Universal AR-15 80% Lower Receiver Jig contains the following parts: 1. 3.079 0.316 0.335 Adjust . 1x Depth Gauge 8. When I had my 5D-Tactical pro jig, it would do AR 10,15, and 9 with the same trigger pocket. $134.99. Best for 3-Gun. 18. Load the 1/4" end-mill and set the final milling depth as before in Step 15. Match the sides of your slot with the alredy milled surfaces from chapter three. - 80% AR15 Lower Receiver - 12" Craftsman Drill Press - 5 speeds (540-3600 RPM) - Drills & Taps: - (A) 1/4 Drill - (B) 13/64 Drill - (C) 1/8 Drill - (D) 5/32 Drill - (E) 3/8 Drill - (F) #40 Drill - (G) 1/2 Drill - (H) 1 1/8 Drill - (I) #42 Aircraft Extension Drill - (J) #3 Drill - (K) 1/4 - 28 Tap - (L) 1 3/16 - 16 Tap - 3/16 Allen Hex Wrench The trigger group is definitely something not to skimp on in terms of quality. 0.000 0.000 4.083 4.451 Clean your machine and then check your work before breaking the setup. Many companies still sell their lowers with M16 trigger pocket dimensions, they are just missing the proverbial "third-hole". You will be cutting a total depth of 0.335" to 0.316" past the center line. AR15/AR10 .308 General Information 2003 aalbert@biggerhammer.net . For .308/AR-10 use the outermost holes on the support and the furthest back holes on . Rapid Shooting Pick. Center line of take-down pin hole Left side face Zero Z axis this face Trigger slot 5/16 end mill (R.156) Fire control . 66 AR Lower Receiver Step-by-Step Chapter 10 The last operation will be cutting the slot for the trigger. Drill trigger, hammer, and selector holes first, then mill the fire control pocket and trigger slot. The depth of the fire control pocket is 1.243, spec is 1.249, diff of 0.006". Another Anderson lower measures 1.255", for a difference of 0.012" between that and this one. Perform a full depth finish pass to bring the pocket to its finished dimensions. This is the O.G. After machining and assembling the polymer lowerand of course adding an upper receiverthe author takes aim with his own homemade 5.56mm AR. Mil-spec trigger, no creep, light pull. For that reason, most people look for a 5.56 NATO chamber in their AR-15. II. FWIW: AR9 BCGs (and there are so many proprietary designs) might play differently with non-milspec triggers, but otherwise should be the same. The most noticeable difference is that the civilian AR15 lower receiver does not have the third trigger pin hole for the auto sear above the safety selector. Hole Size Diagram CNC Gunsmithing www.cncguns.com A 1/4 Drill B 13/64 Drill C 1/8 Drill D 5/32 Drill E 3/8 Drill F #40 Drill G 1/2 Drill H 1 1/8 Drill I #42 Aircraft Ext. The receiver pocket is milled out with a long 7/16" end mill. $134.99. The first trigger (Stag Arms LPK) tried wouldn't rock back enough to allow the disconnect to release without pressing down on the trigger rear shoulder. 1 Review Write a Review. The carbine length gas tube measure 7.5" Midlength - Intermediate - Somewhat rare but best suited for 18" barrel lengths Rifle - The rifle length gas tube measures 10.1875" in length. Variant. As other people have said, it's the same size pocket. Tools Used: - CNC Gunsmithing Drill Jig and Milling Adapter Kit. A5 Use 2 Jig Screws to tighten the Buffer Screw Support to the jig. Remove the 5/16" drill bit from your drill press and replace it with the 5/16" end mill bit. AR-15 Complete Anti-Rotation Trigger / Hammer Pin Set. Put a 1/8" or 5/32" diameter end mill in the spindle and move to 3.079 X. 1 Review Write a Review. - 80% AR15 Lower Receiver from Kevin (with solid fire control pocket) - 12" Craftsman Drill Press - 5 speeds (540-3600 RPM) - Drills & Taps: - (C) 1/8 Drill - (D) 5/32 Drill - (E) 3/8 Drill - (F) #40 Drill - (G) 1/2 Drill - (I) #42 Aircraft Extension Drill - (J) #3 Drill - (K) 1/4 - 28 Tap - 3/16 Allen Hex Wrench - Cutting Fluid (WD-40) 1x Front Support 5. 14 AR Lower Receiver Step-by-Step Chapter 3 Location: Pick up the surface just indicated (butt face) with an edge finder and then the face of the forging that is against the angle plate (deck). Document. 1x Drill Guide 4. The trigger tail has to be pressed down hard to install the selector switch. For AR-15/AR-9 use the innermost holes on the support and the furthest forward holes on the jig. However, this is not a rule. In Stock. Types of AR-15 Triggers. The trigger pocket is also typically milled to different dimensions to prevent the acceptance of an auto-sear as well. You can now remove the trigger hole template from the jig. trigger that Eugene Stoner designed. AR-15 carbine receiver extensions should be 1.14 in diameter, also known as "mil-spec" in the advertising world. 14 of 14. MIL-C-71186(AR) 31 January 1994 MILITARY SPECIFICATION CARBINE, 5.56MM: M4A1 This Specification 1s approved for use by the US Army . Bolt release slot . 2x Side Plate Screw [8-32 x 1.5"] 10. Welcome to Part II of the Billet Rifle System s 80% build! Visually rough out the large pocket of the fire control pocket, but not the rear slot, to a depth of 1.250". Then stack the Trigger Pocket Template #05 so that the smaller end and Use four . 1x Flat Washer [1/4"} 12. Perform a full depth finish pass to bring the pocket to its finished dimensions. Once again I would like to stress the use of eye protection. Near zero reset distance, fastest shooting trigger we've seen. Refer to the drawing "DRIVER SIDE" in the appendix for dimensions for this . See Figure 6.