Use this lapping tool in a 3/8" electric drill to square the upper receiver face of an AR-15. This will improve the mating between the barrel and receiver and needs to be used with a lapping compound. Pilot will also fit into the bolt carrier tunnel to keep perfect alignment throughout the receiver for improved accuracy.
Use in 3/8" electric drill to square upper receiver face.
Pilot fits in bolt carrier tunnel.
Use with lapping compound.
Steel, 8 1/4" long.
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