ProMag 30 Round .223 Rem/5.56 Steel Lined Polymer AR-15 Magazine, Black - RM30SL

ProMag's Rollermag reinvents the wheel by adding them to an anti-tilt follower, in a Technapolymer magazine body. Experience a smooth, anti-tilt rolling feed with the revolutionary RollerFollower for maximum friction reduction. The magazine is built with ProMag's anti-fatigue chrome silicon springs, so you can keep them loaded and stashed for up to six years without worry.ProMag magazines are designed utilizing modern precision injection molding of Mil-Spec polymer compounds. Every ProMag magazine is backed by a lifetime guarantee against manufacturer's defects.Features:Over molded stamped steel feed lips and magazine catchMagazine body constructed of a proprietary DuPont Zytel based polymerPatented anti-tilt Roller followerMagazine spring formed from heat treated chrome silicone wireMade in USA