Constructed of corrosion- and impact-resistant polymer, the KRISS® Defiance DMK22 .22LR 10-Round Factory Magazine offers reliable performance in harsh environments. The steel wire spring, polymer follower, and precision-engineered feed lips ensure smooth feeding performance, while dual magazine catch cutouts ensure a snug, wobble-free fit for added reliability. Better yet, this magazine is equipped with a last-round hold-open device for improved field performance.