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.Features :Fits: Glock 22 / 23 / 24 / 27 / 35Caliber: .40 S&WCapacity: 50 RoundsBody Material: Hardened Steel / PolymerSpring Material: High Carbon Steel