Durable steel construction Steel wire spring Low-friction polymer follower Injection-molded polymer follower Built from durable steel and engineered for long-lasting reliability, the FNA(R) 509A(R) 9mm 10-Round Magazine is a genuine factory pistol magazine, engineered to provide long-lasting performance and durability. FN's 509 pistol evolves on proven pistol platforms with a striker-fired, Midsize Black Stainless Steel-framed firearm with all the features a modern shooter wants-from interchangeable backstraps and aggressive texture to a crisp trigger and lightweight construction. Equipped with a durable steel wire spring and polymer follower, this California-compliant 10-round magazine is ideal for target practice, tactical drills, and trips to the shooting range. FN magazines are backed by the company's world-class customer service, ensuring you'll receive a world-class magazine each and every time. Pick up a few spare magazines for your FN 509 today!