The Promag® AR-15 Rollermag™ .223 Rem, 5.56 NATO 20-Round Magazine is an affordable, yet reliable magazine, designed to deliver exceptionally smooth and reliable performance. This ultrareliable AR magazine features a durable, yet lightweight DuPont® Zytel™ polymer body with aggressive texturing for lightning-fast reloading. A heat-treated chrome silicon wire internal spring eliminates binding, while the patented, anti-tilt roller follower ensures smooth, reliable operation. Made in USA.