The ProMag® 10mm 50-Round Drum Magazine for Glock® 20, 29, 40 Pistols is a performance-enhanced high-capacity magazine, engineered to deliver superior stopping power in any target-rich environment. This drum magazine features a steel-lined DuPont™ Zytel® polymer drum, while the polymer upper tower features a full-length steel insert for improved strength and reliability. The heat-treated chrome silicon wire spring and the injection-molded polymer follower work together to ensure proper cartridge alignment, smooth feeding performance, and consistent operation in any tactical environment. To top it off, this Glock-compatible drum magazine is backed by ProMag’s renowned lifetime warranty, promising superior quality you can truly depend on. Order yours today! Made in USA.