The ProMag Shadow Systems CR920 9mm 50 Round Polymer Drum Magazine is the ultimate high capacity magazine for your trusty micro compact pistol. Engineered to deliver dependable feeding performance and jam free operation, this magazine features proprietary DuPont Zytel polymer construction with a carbon steel feed tower for superior strength, dependable corrosion and shock resistance, and long lasting service life in a lightweight package. 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, while the ratcheting design allows for quick, effortless loading.Features :DuPont Zytel Polymer ConstructionHeat treated Stainless Steel Internal SpringInjection Molded Polymer FollowerMagazine Upper Tower has an Over Molded Heat Treated Carbon Steel Feed Lip Reinforcement50 Round Drum Magazine