Elite Tactical Systems Group Magazine, 223 Remington/556NATO, 30 Rounds, Fits AR Rifles, Carbon Smoke SMK-AR15-30G2 ETS mags won't crack or break" are resistant to heat" cold" UV and harsh chemicals and 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.