CrossTac Armorer's AR-15 Vise Block and Hammer Block

Reversible action block inserts into an AR-15 upper or lower receiver and clamps into a vise, firmly positioning the part for nearly any gunsmithing task. Precision CNC-Machined from polyethylene, this action block is impervious to all oils and solvents. Hammer block is ideal for checking a trigger job. Includes a hammer block which snaps into the action block, this eliminates the need to catch the hammer when testing trigger pull.Note: The CrossTac Armorer's Action Block was designed for torqui