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When working on your AR-15/M16 receiver halves, heavy-duty blocks are essential to avoid crushing, twisting, or distorting them when you apply vise pressure or torque the barrel nut. These blocks keep your rifle firmly in place for safe cleaning, assembly, and repair. The unbreakable urethane vise block absorbs all the clamping force, preventing any damage to the expensive lower receiver. You can insert the block from the top or bottom into the magazine housing and clamp the other end in your bench vise. The magazine catch locks to the block, ensuring a secure hold on the rifle for any work you need to do. Additionally, the block will not cause any scratches or damage to the finish. While it fits tightly in most receivers, you may need to file it down to fit others.