ProMag AR-15 5.56mm 40-Round Steel-Lined Magazine w/ Roller Follower

The ProMag® AR-15 5.56mm 40-Round Steel-Lined Magazine w/ Roller Follower features a steel-lined Technopolymer body, designed to deliver exceptional durability, while over-molded stamped steel feed lips offer a snug, wobble-free fit for reliable operation. A heat-treated, anti-fatigue, chrome silicone wire internal spring, coupled with the proprietary Roller follower, eliminates binding and delivers exceptionally smooth feeding operation for added reliability. Over-molded stamped steel feed lips offer a snug, wobble-free fit for reliable operation. Made in USA.