Experience the true sound of freedom with the ProMag® Sig Sauer® Sig Pro 9mm 50-Round Drum Magazine from GunMag Warehouse. Featuring a heat-treated steel upper tower with a durable DuPont® Zytel™ polymer drum for factory-like feeding performance and speedy reloads while on the move. The reliable loading mechanism offers quick, frustration-free reloads, while the corrosion- and impact-resistant polymer drum delivers exceptional durability and boasts aggressive texturing for speedy reloads and a non-slip grip. If that’s not enough, the heat-treated chrome silicon wire spring and injection-molded polymer follower work together to eliminate binding for flawless operation and reliable feeding performance. To top it off, this ProMag drum magazine is backed by ProMag’s legendary lifetime warranty for lasting field service and superior reliability when it matters most. Made in USA.