An essential tool for any AR15 tinkerer or builder. The AR15 Upper Vise Block is constructed of black injection molded polymer. It'll accomodate any milspec upper receiver. Once the upper receiver is secured on the vise block, it allows you to clamp it down onto a bench vise for any work that needs to be performed on your upper receiver. It securely holds your upper receiver in place while you assemble/disassemble your upper, clean your upper, or make any repairs. Match this upper vise block with our lower vise block for the complete AR enthusiast at-home gunsmith kit.