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January 14, 2016
www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions
9
Drilling the Trigger Slot Holes
: Insert the 19/64” drill bit into the drill and tighten the chuck. Place the
drill bit into the hole labeled “A” as shown in Figure 11. Drill through the Lower Receiver until you exit
under the Fire Control Group. Figure 10 shows the placement of hole “A”. The hole is also labeled on the
Drill Template.
Note
: If a hand drill is being used be sure to hold the drill upright. If the drill is not held upright
blemishes may be visible in the trigger slot after assembly.
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
: 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