Use this lapping tool to square the upper receiver face of
an AERO M4E1. This will improve the mating between the barrel and receiver and
needs to be used with lapping compound. The pilot will fit into the bolt
carrier tunnel to keep perfect alignment throughout the receiver for improved
accuracy. Includes 10ml of 120 grit lapping compound. If your receiver has the
internal barrel nut, where the receiver is threaded inside, this is the tool
Can use 3/8" drill to square upper receiver face.
Pilot fits in bolt carrier tunnel
Use with lapping compound (Included)
Includes 10ml 120 grit lapping compound.