Compatible with most double stack 9mm, double stack .40 cal, single & double stack .45 cal magazines including 1911. GhillieTEX IR Signature reduction technology. Reduce reload cycle time. High-impact resistant polymer case with anti-fragmentation properties. Mount to any MOLLE/PALS 1" web system. Optional double stack capabilities. Magazine stays secure without pouch flap, hook, cover or bungee. Resistance to solar heating.