Accurate-Mag AICS Pattern Double Stack Magazine 300 WSM 7 Round. This Accurate-Mag magazine is constructed of high-quality steel heat treated for durability and boasts a black Teflon finishing for increased longevity. The magazine is designed to fit the Accuracy International Chassis System (AICS). This magazine fits the .300 and .325 Winchester Short Magnum (WSM) round in a double-stack single-feed configuration with a 7 round capacity. Accurate-Mag offers the perfect magazines for any shooter.