Page 1 Universal AR-15 80% Lower Receiver Jig Instructions.; Page 2 March 25, 2015 Modulus Arms Jig Contents The Modulus Arms Universal AR-15 80% Lower Receiver Jig contains the following parts: 1x Template 1x Depth Gauge 2x Side Plate 14x Screws [8-32 x ½"] 1x Drill Guide 2x Side Plate Screw [8-32 x 1.5"] 1x Front Support 10.; Page 3 March 25, 2015 Required Tools The following items.. After doing a bit of research, I decided the Modulus Arms Heavy Duty Universal Jig was the way to go. The jig arrived one day earlier than estimated, which was great. I was impressed with the jig right out of the box. A couple of friends have jigs from other companies, and this jig is a much better design. The extra-wide top plate is the most.
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.. Fast and Easy - The Multiplatform Router Jig PRO by 5D Tactical is the fastest and easiest universal 80% lower jig on the market today, bar none.; Incredibly Durable - The first universal 80% lower jig ever to offer all ultra-hardened, heat treated steel wear surfaces. The 1.25 inch thick drill guide is constructed of 100% hardened steel, and the side plates house 1.5 inch ultra-hardened steel.