Fully adjustable to fit bolt-action rifles, break-open shotguns, AR-15s, and both automatic pistols and revolvers, for cleaning, maintenance and upgrading. Holds hinged-receiver rifles and break-open guns for easy inspection without complete disassembly. Constructed of stiff, solvent-resistant nylon for years of dedicated firearm cleaning. Comes with an AR block that provides a premium base for cleaning or light gunsmithing on your AR-15, in breech or closed position. Convenient polymer block rotates 180. Item Note: Not to be used as a shooting rest. Type: Vises.