Supports AR-15 for cleaning and light gunsmithing operations; Designed for use with Tipton Best Gun Vise, mounts to center rail with included fasteners; Also designed to mount to your benchtop, with the included fasteners; Innovative bolt service station locks bolt in for servicing extractor pin; Center section rotates 180 degrees (in 7 degree increments) and locks into place at the desired location; Locks into place using magazine lock on your receiver; Built-in hammer stop prevents damage to the 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