KCI’s 50-round drum magazine for the Glock® 17 / 19 / 26 really cuts down the number of times you have to stop for a mag change during range practice. It’s also an excellent way to increase the capacity of a 9mm Luger chambered AR-15 that uses Glock® pistol magazines. Compatible with any 9mm Glock® pistol that uses a double-stack magazine (sorry - won’t work on your G43!), KCI’s drum is constructed of lightweight reinforced polymer with steel reinforcements. There’s a chrome silicon spring with plenty of energy to ensure smooth, reliable feeding. Drum mags are usually a bear to load, but KCI's quick-loading lever makes loading up the full 50 rounds a breeze. A locking mechanism also lets you store this mag fully loaded without damaging the feed lips. Fits Gen3 or later Glock 17 / 19 / 26 pistol (does not fit G43) Also fits Kel-Tec Sub 2000 carbine & 9mm AR-15s that use Glock mags Sturdy steel & polymer construction Quick load lever for easy, fast reloads The KCI 50-rd drum magazine fits Gen3 or later Glock 17 / 19 / 26 pistols, as well as 9mm carbines that use 9mm Glock magazines, including the Kel-Tec’s Sub 2000, Lone Wolf AR-15 carbine, and others. C’mon - grab your Glock, hit the range, and bang the drum!