Features and Specifications:Manufacturer Number: AA762R-02ProMag Archangel OPFOR MagazineCaliber: 7.62x54RCapacity: 10 RoundsBody Material: Carbon Fiber Filled PolymerSpring Material: Chrome Silicon WireFollower Material: Dupont Zytel PolymerBaseplate Material: Dupont Zytel PolymerLifetime WarrantyMade in the U.S.A.Finish: BlackFits:Requires the ArchAngel OPFOR Precision Rifle Stock to be installed on the following rifles:Most Mosin-Nagant M1891 RiflesHex/Round receivers on the 91/30Soviet M-38/M-44/Chinese T-53 CarbinesFinnish M-39 Rifles and Carbines