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January 14, 2016
www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions
7
Side Plates
: Place the Left Side Plate into position and thread two ½” screws into the top through the
Top Plate as shown in Figure 7. Repeat for the Right Side Plate. Leave these four screws loose. Squeeze
the side plates together against the sides of the lower receiver. When they are tight to the lower
receiver, tighten the four ½” screws to 1 ft-lb. Screw the 8-32 x 1.5” Side Plate Support Screw into the
Right Side Plate and all the way through into the Left Side Plate as shown in Figure 8. Tighten to 1 ft-lb.
Do not install the ¼-20 x 1.5” Rear Takedown Screw.
Note
: Many questions have been asked about the Side Plate Support Screw. It is used to prevent
the side plates from flexing in when clamped in a vise. That is why both sides are threaded.
Note
: It is recommended to put masking tape or some other protection over the sides of the
lower before installing the side plates. Doing so will help prevent scratches or wear.
Figure 7: Side Plate Screws
Figure 8: Support Screw Location
Leave Loose
Left Side Plate
Screws
Right Side Plate
Screws
Side Plate Support Screw
DO NOT INSTALL