Give people something to talk about during your next range day with the ProMag® FN® 509 50-Round Polymer Drum Magazine. The body features a proprietary lightweight, yet durable DuPont® Zytel™ based polymer construction, and the upper magazine tower features durable blue steel construction for added durability with your pistol. If that's not enough, this aftermarket drum magazine boasts an injection-molded polymer follower and a heat-treated stainless steel wire spring to ensure proper cartridge alignment and smooth, proper feeding to prevent jams and other malfunctions while you're sending lead down range and ringing steel. It is backed by a lifetime warranty from ProMag. Made in USA.