The Ruger American® Rifle 4-Round .308 Multi-Caliber Magazine is a genuine Ruger factory accessory designed for the Ruger American® Rifle. It’s compatible with short-action rounds, including the .308 Win., 6.5 Creedmoor, 6mm Creedmoor, .243 Win., and 7mm-08 Rem. This polymer flush-fit magazine provides reliable performance.