These magazines are constructed from hand-laid carbon fiber, and maximizes internal length to accommodate to extended cartridge length to 6.5 PRC. These magazines offer excellent durability and weight savings. Note: For use with the HAVAK PH1, PH2, Element DBM rifles chambered in 6.5 PRC ONLY. NOT compatible with AICS or the HAVAK BRAVO rifle. Seekins Precision Carbon Fiber 3rd 6.5 PRC Magazine 0010330021