Experience maximum performance combined with maximum reliability with the ProMag® AR-15 9mm SMG 50-Round Drum Magazine. This aftermarket magazine boasts lightweight DuPont™ Zytel® polymer construction for superior strength and a long lifetime of use. The injection-molded polymer follower and heat-treated stainless steel spring ensure smooth, reliable feeding for those long, range days or defensive situations. Field-tested and proven by USPSA competition shooters at ProMag, these drum magazines are proudly made in America and sold with a lifetime warranty to ensure years of reliable performance. Pick up a magazine loader to save yourself time and effort when reloading your 50-round drum magazine. Get maximum firepower today with a 50-round magazine from ProMag! Made in USA.