Ensures perfect and true barrel mating surface
Helps align gas tube through barrel nut holes
Assists in aligning front & rear A2 sights
Features 220 grit lapping compound
Lapping a receiver ensures a perfectly square and true surface for the barrel to mate against, thus enhancing accuracy. Also, honing the surface can produce optimal positioning of barrel nut so ideal torque can be achieved along with proper gas tube hole alignment. Use with a battery powered or electric drill to square the receiver face on an AR-15. Helps align the gas tube through the barrel nut holes and align front and rear A2 style sights. Features 220 grit lapping compound.