www.ModulusArms.com | AR-15 Jig Instructions
Side Plates: Place the side plate into position and thread two ½” screws into the top through the
template as shown in Figure 8. Leave loose. Repeat the same steps on the other side plate. Each side
plate is identical and can be placed on either side. When both side plates are attached loosely, 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 as shown in Figure 9. Screw the two 1-1/2” screws through
the side plates to connect them together as shown in Figure 10. Tighten these two screws to 1 ft-lb. Do
not install the 1/4-20 bolt.
Note: Many questions have been asked about these two 1-1/2” screws. They are used to
prevent the side plates from flexing in when clamped in a vise. That is why both sides are
threaded.
Note: The side plates are identical and can be used on either side. If you wear out any hole, you
have three more sets of holes to use.
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 8: Side Plate Alignment
Figure 9: Side Plate Tightening
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