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January 14, 2016
www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions
10
Drilling the Fire Control Group Holes:
Slide the 3/8” drill stop onto the 3/8” drill bit. Insert the 3/8” drill
bit into the Depth Gauge in the slot labeled “C” as shown in Figure 12. Make sure the drill bit is inserted
all the way into the slot and tighten the drill stop onto the drill bit. Next, drill the six holes labeled “C” 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.
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
