KCI USA Drum Magazine, 40 S&W, 50 Rounds, For Glock 22/23/27, Black KCI-MZ028 KCI's 50 round 40 Smith & Wesson Glock pattern drum is a clear glass-filled polymer body and features steel internal components. The load assist lever makes for fast and effortless 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.