Brownells AR-15/M16 Receiver Action Block

AR-15/M16 Receiver Action Block Features: Protect Receiver From Damage When Clamping. Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing twisting or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe effective cleaning assembly and repair. High pressure solvent resistant structural Rynite block and insert surround the entire upper receiver and support it inside and out to make rebarreling the AR-15/M16 an easy one-man job. Lets you firmly secure a mil-spec carry handle receiver or mil-spec flattop receiver in a large bench vise for barrel removal/installation. Torque generated while tightening the barrel nut is transmitted to the block and insert not the receiver. Minimizes the possibility of damage to the barrel detent pin and receiver detent notch. Holds securely without marring the finish. AR-15/M16 Receiver Action Block Specifications: Injection-molded Rynite Black Fits A1 A2 Standard flattop receivers Block - 2.5 (6.3cm) thick 3.5 (8.8cm) wide 4.5 (11.4cm) high Insert - 8 (20cm) long Torque tested to 200 ft. lbs.