The Delta Series LR308 Mag Well Vise Block is designed for use with the TiptonA(R) Best Gun Vise(TM) but can also be mounted directly to a workbench. Simply inserts into the magazine well and provides a steady base for cleaning or light gunsmithing on your LR 308, in either breech or closed position. Easily installs into the aluminium track on the Tipton Best Gun Vise. Loaded with handy features, this tool is a must have for anyone with an LR 308. See below for compatibilities. Bench top mounting fasteners and Best Gun Vise fasteners are included. Compatible with all "LR" style lowers which use the SR25 type magazines. Supports LR 308 for cleaning & light gunsmithing operations Designed for use with TiptonA(R) Best Gun Vise, mounts to center rail with included fasteners Can also be mounted to your bench top with the included fasteners Innovative bolt service station locks bolt in for servicing extractor pin Center section rotates 180Adeg (in 15Adeg increments) and locks into place at desired location Built-in hammer stop prevents damage to lower receiver while dry firing 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