Brownells AR-15/M16 Upper Receiver Lapping Tool

The Brownells AR-15/M16 Upper Receiver Lapping Tool is designed to true and lap the upper receiver's barrel extension seat, ensuring proper alignment and a precise fit between the upper receiver and barrel extension. This gunsmithing tool helps improve accuracy and consistency by creating a perfectly flat, square mating surface. Compatible with AR-15 and M16 pattern upper receivers, it is an essential tool for gunsmiths performing barrel installations or receiver fitting work.