Product Description The ProMag Industries AR-15 5.56mm RollerMag magazine is built for dependable feeding and long-term service in demanding range, training, and field use. This 30-round magazine features a durable black polymer body constructed from a proprietary DuPont(TM) ZytelA(R)-based material, reinforced with over-molded stamped steel feed lips and a steel-lined magazine catch area to enhance durability and consistent fit. Inside, a patented anti-tilt roller follower and a precision-wound, heat-treated chrome silicon spring help promote smooth, reliable operation. Made in the USA and backed by ProMags lifetime guarantee against manufacturers defects. Product Highlights 30-round capacity magazine designed to fit AR-15A(R) 5.56mm / .223 platforms Patented anti-tilt roller follower for smoother, more consistent feeding Steel-reinforced feed lips and magazine catch for added strength and longevity DuPont(TM) ZytelA(R)-based polymer body provides lightweight, corrosion-resistant performance Heat-treated chrome silicon spring engineered for long-term reliability Specs Brand: ProMag Industries Manufacturer Part Number: RM-30-SL UPC: 708279014277 Platform Compatibility: AR-15A(R) / 5.56mm / .223 Capacity: 30 rounds Color: Black Body Material: Polymer (proprietary DuPont(TM) ZytelA(R)-based) Reinforcement: Over-molded stamped steel feed lips and magazine catch Follower: Patented anti-tilt roller follower Spring Material: Heat-treated chrome silicon wire Country of Manufacture: USA Warranty: Lifetime guarantee against manufacturer defects (per manufacturer) Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.