The ProMag® Smith & Wesson® CSX® 9mm 20-Round Blue Steel Magazine is a must-have high-capacity aftermarket magazine for the target shooter or mag-dump enthusiast, featuring heat-treated steel construction with a corrosion-resistant blued finish for long-lasting performance and consistency in any shooting application. The injection-molded polymer follower and chrome silicon wire spring ensure smooth, jam-free operation, while precision-machined witness holes allow for quick, visual round counts at a glance. If that's not enough, this 32-round magazine comes equipped with a removable polymer floor plate for improved shock resistance and quick disassembly when required. Lifetime warranty. Fits CSX pistols ONLY. Made in USA.