ProMag AR-15 M-16 Lower Receiver Mag Well Vise Block-Black

The ProMag AR-15 M-16 Lower Receiver Magazine Well Vise Block allows the user a third-hand to work on and install parts to AR-15 and M-16 lower receivers. The vise block is clamped into the users vise, and the block is then inserted into the lower receivers magazine well, and is held in place by the magazine catch. It is constructed of a black injection molded polymer.