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 TiptonA(R) Best Gun ViseTM, 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. Features Supports AR-15 for cleaning & light gunsmithing operations Designed for use with TiptonA(R) Best Gun ViseTM, mounts to center rail with included fasteners Also designed to mount to your bench top, with the included fasteners Innovative bolt service station locks bolt in for servicing extractor pin Center section rotates 180Adeg (in 7Adeg increments) and locks into place at desired location Locks into place using magazine lock on your receiver Built-in hammer stop prevents damage to lower receiver Solvent-resistant polymer provides durability and is non-marring to surfaces Mag well arm is removable for clamping in a bench vise when additional rigidity is required