KCI USA Drum Magazine, 9MM, 50 Rounds, For Glock 17/19/26, Black KCI-MZ027 The 50 round 9x19mm Glock pattern drum features their proprietary polymer construction and steel internals. The ratcheting load assist lever provides efficient and easy loading. Disclaimer: Lifetime Warranty VOIDED if customer disassembles magazine! This magazine is not designed to be used with hollow point ammo. For use in Glock patterned pistols.