The ProMag Standard AR-308 20rd Detachable Polymer Magazine is a reliable and durable accessory designed for your AR-308 or .308 caliber AR-type rifles that use LR-308 (DPMS) or SR-25 pattern magazines. Crafted from high-quality DuPont Zytel polymer this magazine is lightweight yet sturdy ensuring long-lasting performance. It features an injection-molded magazine follower and a mag spring formed from chrome silicone wire for smooth and consistent feeding. Proudly made in the USA this magazine offers a 20-round capacity and a sleek black finish. Please note it is not compatible with rifles using Armalite pattern magazines.