www.ModulusArms.com | AR-15 Jig Instructions
down firmly to prevent the router from lifting. Do not try to move the router in one straight direction
but rather in smooth half circles removing small amounts of material as you proceed. Join the trigger
slot opening with the drill holes and then start to widen the opening until you reach the template. When
you reach the template, trace the inside diameter of the template in a clockwise motion. Be sure to
remove as much material as possible before touching the template or tracing the template. Reducing
the amount of time in contact with the template will increase its longevity. Do not push hard against the
template. A gentle touch is enough. Mill the rounded corners in the template last, as they are most likely
to chatter. When the opening is the same size as the template turn off the router, wait for it to
completely stop and remove it. Adjust the router base so the end mill is at the next mark on the depth
gauge. Continue in this pattern until you reach the bottom of the depth gauge.
Note: DO NOT INSERT OR REMOVE THE END MILL FROM THE TEMPLATE WHILE THE END MILL IS
SPINNING. THIS IS DANGEROUS AND THE MOST COMMON CAUSE OF BROKEN END MILLS OR
DAMAGED JIGS/LOWERS.
Note: Be sure the end mill is very tight in the router. Tighten it as much as possible.
Note: If the router begins to whine or vibrate during milling, turn the router off and remove it
from the template. Inspect the end mill and be sure there are no chips jammed into the teeth of
the end mill. If there is, use a tool to remove the stuck chips. A small screwdriver or pencil works
well. Be sure not to damage the teeth.
Note: If you have a shop vacuum, use it. We recommend sticking it between the lower and the
template over the magazine opening. It typically fits and stays. Run the vacuum whenever you
are milling. If you do not have a shop vacuum, stop regularly are remove the chips. If they build
up, they can become stuck between the end mill and the template and melt. This build up can
be removed from the end mill with sand paper. Use of a cutting fluid or WD-40 is
recommended.
Figure 22: End Mill Depth for Fire Control Pocket
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