Modulus Arms AR-15 - Drilling the Trigger and Rear Shelf Holes; Trigger Slot Drilling

www.ModulusArms.com
March 25, 2015
www.ModulusArms.com | AR-15 Jig Instructions
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Figure 10: Vise Screws
Drilling the Trigger and Rear Shelf Holes
Trigger Slot Drilling: With the two exposed holes in the trigger slot, use the 19/64” drill bit to drill all the
way through the lower. View Figure 11 for locations.
 Note: If a hand drill is being used be sure to hold the drill upright. If the drill is not held upright
blemishes will be visible in the trigger slot after assembly. This is true for all drilling of the lower.
 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. This is true for all drilling of the lower.
 Note: Use plenty of WD-40 or cutting fluid and remove the chips regularly. This is true for all
drilling of the lower.
Figure 11: Trigger Slot Holes