Supports AR-15 for cleaning & light gunsmithing operations. Designed for use with Tipton 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 180 (in 7 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.