Constructed of a lightweight yet durable polymer the FN 502 .22LR 10-Round Magazine is a factory OEM rimfire magazine designed to deliver superior reliability and unparalleled corrosion resistance in virtually any environment. This magazine features a built-in side loading button for quick effortless loading while the loading channel serves as a witness window for quick visual round counts and improved reliability while on the move. The steel wire spring and anti-tilt polymer follower work in tandem to deliver smooth operation and jam-free feeding performance while the blued steel feed lips offer a precise fit for added reliability.Features: Lightweight polymer construction Steel wire spring Anti-tilt follower Side loading button for simple loading Blued steel feed lips