The ProMag Industries DPM-A4-FDE 40-Round AR-308 Magazine delivers unmatched durability and performance for your .308 caliber rifles. Engineered with high-quality Dupont Zytel polymer, it ensures reliable feeding and longevity in various conditions. Designed specifically for DPMS/SR-25 pattern rifles, this magazine features a precision-engineered spring for smooth operation. Made in the USA and covered by a lifetime guarantee, this magazine reflects rigorous quality standards at every stage of production. 40-Round Capacity Compatible with AR-308 / .308 Cal AR Type Rifles Using LR-308 (DPMS) or SR-25 Pattern Magazines Constructed with Dupont Zytel Based Polymer Injection Molded Magazine Follower Heat Treated Chrome Silicon Wire Spring Not Compatible with Armalite Pattern Magazines Proudly Made in the U.S.A. Invest in the reliability and performance of the ProMag DPM-A4-FDE magazine for superior shooting experiences.