www.ModulusArms.com | AR-15 Jig Instructions
Drilling the Hammer, Trigger and Safety Pin Holes
Insert the Rear Takedown Bolt: Insert the rear takedown bolt through the rear takedown hole in the
side plate, put on the flat washer and tighten rear takedown nut as shown in Figure 25.
Figure 25: Rear Takedown Bolt
Drilling the Safety Hole: Clamp the jig in the vise as shown in Figure 26. Insert the 3/8” drill bit into the
drill. Drill the hole shown in Figure 27 through one side of the lower receiver. Do not drill all the way
through. Flip the jig over and repeat in the opposing hole. Be sure to always use the hole locations
closest to the top Template.
Note: Be sure to be in the correct hole location. If you are not in the correct location you can
damage your lower receiver.
Note: If a hand drill is being used be sure to hold the drill upright.
Note: Use a vise, C-clamp or other mechanism to hold the Jig.
Note: Be sure not to start spinning the drill until after the drill bit is placed into the drill guide or
premature wear will occur.
Note: Use plenty of WD-40 or cutting fluid and remove the chips regularly.
Note: The extra holes below are there because the side plates and universal. They give you two
times the amount of holes for drilling so you do not need to replace your side plates from
premature wear.
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