The MDT 104447-FDE AICS Magazine 10rd Extended 308/6.5 Creedmoor Short Action is designed for use with AICS chassis systems and MDT compatible bottom metals. Caliber compatibility includes .308 WIN, 6.5 Creedmoor, 6mm Creedmoor, 22-250 Rem, 243 Win, 6mm XC, 260 Rem, 7mm-08 Win, and 308/7.62x51 NATO. Not recommended for .300 WSM. The magazines are made from polymer with a tempered steel spring. They are designed to fit MDT TAC21, ACC, ESS, LSS-XL, XRS, and LSS chassis and can support various other M24 type chassis and bottom metals. They are not compatible with Winchester XPC inlet and may require adjustments for the Winchester Model 70. These magazines work with XLR Chassis, GRS riflestocks, CDI bottom metals, and Pacific Tool & Gauge bottom metals configured for AICS magazines. At MDT, magazines undergo rigorous testing with high-strength polymer and a high glass content. Not available to ship to California.