Product Description The ProMag Industries AR-308/.308 Winchester 40-round magazine is built for high-capacity range time and reliable feeding in compatible AR-308 pattern rifles. Manufactured in the USA, it features a rugged proprietary DuPont(TM) ZytelA(R)-based polymer body, an injection-molded polymer follower, and a precision-wound, heat-treated chrome silicon spring for consistent performance. Designed to fit LR-308 (DPMS) and SR-25 pattern magazine wells, it is not compatible with rifles that use Armalite pattern magazines. ProMag magazines are backed by a lifetime guarantee against manufacturer&';s defects. Product Highlights 40-round AR-308 / .308 Winchester magazine for extended shooting sessions Compatible with LR-308 (DPMS) and SR-25 pattern magazine rifles (not Armalite pattern) Proprietary DuPont(TM) ZytelA(R)-based polymer magazine body for durable, lightweight performance Injection-molded follower helps promote smooth, consistent feeding Heat-treated chrome silicon spring is precision wound for long service life Specs Brand Name: ProMag Industries Manufacturer Part Number: DPM-A4-FDE UPC: 708279016028 Caliber: .308 Winchester Capacity: 40 rounds Color: Flat Dark Earth (FDE) Body Material: Proprietary DuPont(TM) ZytelA(R)-based polymer Follower: Injection-molded polymer Spring: Heat-treated chrome silicon wire Compatibility: AR-308 / .308 AR type rifles using LR-308 (DPMS) or SR-25 pattern magazines Not Compatible With: Rifles using Armalite pattern magazines Country of Manufacture: USA Warranty: Lifetime guarantee against manufacturer&';s defects 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 product&';s manufacturer.