Helps True The Upper Receiver For Precise Barrel Fit & Maximum Accuracy
Cold-rolled steel lapping tool chucks into a 3/8" hand drill to easily “square” the upper receiver face on your AR-15. Helps ensure precise mating of barrel and receiver for added accuracy. Coat face of receiver with aluminum-oxide lapping compound; extra long pilot slides into the bolt carrier tunnel to maintain perfect concentricity with the receiver.
AR-15, Issue:11, Page:085
Big Book Catalog, Issue:70, Page:083
SPECS: Cold-rolled steel, in the white. 8¼" (21cm) long,
3/8" (9.5mm) diameter shank.