Polymer MDT AICS External Box Magazines for MDT Chassis systems. Also works in many other M24 type chassis and bottom metals. CAPACITY .308/6.5 Creedmoor family of cartridges: 3 Round capacity MAX OAL: 2.850" 3.25" tall COMPATIBILITY MDT AICS magazines are guaranteed to work in our HNT26, XRS, TAC21, LSS, LSS-XL, HS3, ESS and ACC chassis systems. They do not work with the following inlets; Winchester XPC and may require fitting in Winchester Model 70. Based on customer feedback, the following systems work well with our magazines, but fitting may be required in some cases. XLR Chassis KRG X-Ray - Some need adjustment GRS riflestocks- (Configured for AICS magazines) CDI Precision bottom metals- (Configured for AICS magazines) Pacific tool and Gauge bottom metals- (Configured for AICS magazines) COMPATIBLE CALIBERS .308WIN 6.5 Creedmoor 6mm Creedmoor 22 - 250 Rem (will work at a reduced capacity) 243 Win 6mm XC 260 Rem 7mm-08 Win 308/7.62x51 NATO Not recommended for .300 WSM. Use a metal magazine for this caliber as the feed lips need adjustment.