Constructed of an impact- and chemical-resistant polymer, the MasterPiece Arms® 5.7x28mm 20-Round Magazine affords users superior firepower in virtually any scenario. Designed to deliver reliable field performance, smooth feeding, and extreme durability without any added weight, this 20-round magazine features a high-tensile steel wire spring and anti-tilt polymer follower for smooth, jam-free feeding performance, while the precision-engineered feed lips deliver a snug, wobble-free fit for added reliability. Machined witness holes deliver fast and easy visual round counts, while the impact-resistant floor plate is easily removed for quick maintenance and cleaning. 20-round capacity.