The Delta Series AR-15 Mag Well Vise Block is quite possibly the handiest tool an AR-15 owner could ask for. Designed for use with the Tipton Best Gun Vise, this center support slides into the magazine well and provides a steady base for cleaning or light gunsmithing on your AR-15, in either breech or closed position. Users without a Best Gun Vise can mount the Mag Well Vise Block directly to their bench top with the included fasteners. Loaded with handy features, this tool is a must have for anyone with an AR-15