This 3-round detachable magazine fits Ruger's Gunsite Scout rifle chambered in 308 Winchester, 6.5 Creedmoor, and other 308 Win-sized cartridges. It has a 60-percent glass-filled polymer design for strength and durability, a stainless steel spring for reliable feeding and corrosion resistance, and a dust cover to protect from damage and debris during transportation and storage. It is designed to function with many AI-style bottom metal assemblies in 308 Win-sized cartridges. Note: This magazine is not compatible with Ruger Precision Rifle.