This is a Glock 9mm 50-round drum magazine
Featuring all-black, glass-filled polymer construction with hardened steel inserts, these 50-round Glock drum magazines work with all double-stack 9mm Glock pistols (Gen 3 or later) and compatible carbines like the Kel-Tec Sub 2000 and AR-15s chambered in 9mm.
KCI drum magazines deliver maximum capacity and impressive quality for the world’s most popular pistols—all at a price that’s hard to beat. Every KCI magazine comes with a lifetime warranty, ensuring you’ll receive a free replacement if there’s ever an issue with your purchase.
KCI Glock drum magazines come with heat-treated internal chrome silicon wire spring for maximum reliability and smooth feeding, and special finger taps for quick and easy reloading.
Compatible with Glock 17, 19, 26 and 34 pistols. NFA C-9 lowers will require slight ejector modification to work with KCI drum magazines.