Engineered to deliver exceptional field performance at an affordable price, the ProMag® FN® 509 9mm 17-Round Blued Steel Magazine is a must-have for any shooter on a budget. Featuring heat-treated steel construction with a corrosion-resistant blued finish, this centerfire pistol magazine boasts a high-strength chrome silicon spring and injection-molded polymer follower for consistent cartridge alignment and smooth feeding performance. Numbered witness holes allow for quick visual round counts, while the removable floor plate allows for easy disassembly and maintenance in the field. If that's not enough, this centerfire pistol magazine is backed by a lifetime warranty. Order today! Made in USA.