Elite Tactical Systems Group Magazine, 223 Remington, 556NATO, 30 Rounds, Black, AR Rifles GN-AR15-30G2BLK ETS mags won't crack or break" are resistant to heat" cold" UV and harsh chemicals-won't become brittle over time. Their mags come with enhanced features like non-tilt followers" creep-resistant feed lips and clear body allowing you to see count and ammo type-leaving nothing to chance.