The MDT Detachable Box Magazines are designed to fit the MDT Chassis systems, as AICS style bottom metals & chassis. Available in 308. Manufactured from high quality polymer, with a tempered steel spring. 308 magazine is also compatible with .308, 22-250, .243 and 6.5 Creedmoor. Maximum cartridge overall length for the 308 is 2.800". Mfg: Modular Driven Technologies SPECS: Fits AICS style bottom metals and chassis. 308 works with .308, 22-250, .243 and 6.5 Creedmoor.