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Summary of Contents for Modulus Arms Heavy-Duty Universal AR-15 80% Jig
- Page 1 Heavy-Duty Universal AR-15 80% Lower Receiver Jig Instructions...
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Page 2: Step
1x Rear Support (Al 6061-T6) 11. 1x Side Plate Support Screw [8-32 x 1.5”] 1x Buffer Support (Al 6061-T6) 12. 1x Rear Take Down Screw [1/4-20 x 1.5] Figure 1 Jig Contents www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions... -
Page 3: Www.modulusarms.com | Heavy-Duty Universal Ar-15 80% Jig Instructions
January 14, 2016 Required Tools The following items are required to finish the 80% AR-15 Lower Receiver: (Available for sale on Modulus Arms Website as Jig Fabrication Kit) ¼” Dia, ¼” Shank, 4” Long, 1” Cut, Square End Mill 3/8” Drill Bit 19/64”... - Page 4 Front Support: The front takedown pin secures the front support as shown in Figure 4. For best results, the spring and detent from the Modulus Arms AR-15 Lower Parts Kit may be used. Optionally, Modulus Arms offers an AR-15 Front Takedown Kit. To install the Front Support using a Front Takedown Kit, follow Steps 1-5 in Figure 4.
- Page 5 Threading in two of the screws to use as a handle can help to install the buffer support. Step 2 Step 1 Step 3 Step 4 Figure 5: Buffer Support and Rear Support Attachment www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 6 Now, tighten the screws attaching the Rear Support to the Buffer Support from the previous step to 1 ft- lb. The Top Plate should now be secure. Figure 6: Top Plate Attachment www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 7 Doing so will help prevent scratches or wear. Right Side Plate Screws Left Side Plate Screws Figure 7: Side Plate Screws DO NOT INSTALL Side Plate Support Screw Figure 8: Support Screw Location www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 8 Drill Template: Place the Drill Template into the Top Plate as shown in Figure 9. Thread two ½” screws into the locations shown in Figure 9. Tighten the screws to 1 ft-lb. Screws Figure 9: Drill Template www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 9 Note: Use plenty of WD-40 or cutting fluid and remove the chips regularly. Note: All the above notes are true for all drilling and will not be repeated. Figure 10: Drill Template Hole Placement Figure 11: Hole “A” location www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 10 Note: Be sure the drill stop is tight. Check the placement of the drill stop with the Depth Gauge after each hole. This applies for all drilling. Figure 12: Slot C Figure 13: Hole “C” Location www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 11 Next, drill the two holes labeled “B” in Figure 10. The holes are also labeled on the Drill Template. Be sure to drill to the depth specified with the drill stop and do not go any further. Figure 12: Slot B Figure 13: Hole “B” Location www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 12 Insert the Router Template into the Top Plate as shown in Figure 14. Thread the four screws as shown in Figure 14.Tighten the screws to 1 ft-lb. Screws Figure 14: Configuration for Fire Control Group Milling www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 13 This build up can be removed from the end mill with sand paper. Use of a cutting fluid or WD-40 is recommended. www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 14 January 14, 2016 Figure 15: Fire Control Group Depth Setting Figure 16: Fire Control Group Router Placement Figure 17: Fire Control Group Second Depth Mark www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 15 Template around and insert into the Top Plate as shown in Figure 18. Thread the four screws as shown. Tighten the screws to 1 ft-lb. Screws Figure 18: Fire Control Drill Guide Setup www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 16 This build up can be removed from the end mill with sand paper. Use of a cutting fluid or WD-40 is recommended. Figure 19: Rear Shelf Depth Setting www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 17 January 14, 2016 Figure 20: Rear Shelf Router Placement www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 18 This build up can be removed from the end mill with sand paper. Use of a cutting fluid or WD-40 is recommended. Figure 22: Trigger Slot Depth Setting www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 19 Insert the Rear Takedown Screw: Insert the Rear Takedown Screw through the rear takedown hole in the Right Side Plate and tighten to 1 ft-lb as shown in Figure 23. Rear Takedown Screw Figure 23: Rear Takedown Screw www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 20 3/8” drill bit into the drill. Drill the hole shown in Figure 24 through one side of the lower receiver. Do not drill all the way through. Flip the jig over and repeat in the Left Side Plate. Figure 24: Safety Hole Location www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
- Page 21 Figure 25 through one side of the lower receiver. Do not drill all the way through. Flip the jig over and repeat in the opposing holes shown in Figure 26. Figure 25: Right Side Holes Figure 26: Left Side Holes Done! Go Shooting! www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions...
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