Stainless steel body Durable polymer pinky extension floor plate Steel wire internal spring Anti-tilt polymer follower Specifically designed for snag-free performance in concealed-carry applications, the FNA(R) 503(TM) 9mm 6-Round Magazine features a corrosion-resistant, heat-treated stainless steel body for superior strength and durability in harsh, fast-action environments. The removable polymer pinky extension floor plate offers improved comfort and control, while the high-tensile steel wire spring and anti-tilt polymer follower work in tandem to ensure flawless feeding operation. Better yet, this centerfire pistol magazine features precision-machined feed lips for a secure fit and improved operation, while the factory-machined witness windows offer quick, visual round counts while on the move for improved field reliability.