ProMag's Rollermag redefines magazine innovation by integrating rollers into an anti tilt follower within a durable Technapolymer body. The revolutionary ROLLERFOLLOWER ensures a smooth, friction-free feed while ANTI-FATIGUE chrome silicon springs allow the magazine to remain loaded and ready for up to 6 years without compromising performance. Magazine with a 30-round capacity Compatible with AR-15 5.56mm rifles The magazine body is constructed from a proprietary DuPont Zytel based polymer for exceptional strength and durability Equipped with a patented anti-tilt roller follower for improved reliability and smoother feeding Magazine spring crafted from heat-treated chrome silicon wire for enhanced longevity and consistent feeding performance Proudly made in the USA for superior quality and craftsmanship