ETS 9mm Mag for Glock 17/18Fits the Glock 17, 18, 19, 19x, 26, 34, and 45 Compatible with Gen 1 through Gen 5 Glocks Extended 31 round capacity ETS mags won't crack or break, are resistant to heat, cold, UV and harsh chemicals won't become brittle over time. ETS 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. Advanced Polymer Benefits: Extreme Impact Resistance