Stainless steel body Durable polymer floor plate Steel wire internal spring Anti-tilt polymer follower Specifically designed for concealed-carry applications, the FNA(R) 503(TM) 9mm 8-Round Magazine is a factory OEM magazine, designed to deliver superior reliability and lasting field service in harsh, tactical environments. This magazine features a heat-treated, precision-machined stainless steel body with a polymer floor plate, designed to deliver maximum firepower in a compact package for snag-free carry and improved control. Better yet, this pistol magazine comes equipped with a high-tensile steel wire internal spring and an anti-tilt polymer follower for smooth, jam-free feeding performance, while the precision-machined feed lips ensure a snug, wobble-free fit for improved reliability.