Elite Tactical Systems Group Magazine, 9MM, 40 Rounds, Fits Smith & Wesson M&P9, Carbon Smoke SMK-SW9-MP-40 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.