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. The innovative bolt service station locks bolt in for servicing extractor pin and the center section rotates 180 deg (in 7 deg increments) and locks into place at desired location by using the magazine lock on your receiver. A built-in hammer stop prevents damage to lower receivers and the solvent-resistant polymer construction provides durability and is non-marring to firearms surfaces. The mag well arm is removable for clamping in a bench vise when additional rigidity is required.