This proprietary 5-rd detachable magazine is for the Archangel OPFOR Series Precision Rifle Stock. It is suitable for most Mosin-Nagant rifles, both hex and round receiver, the Soviet M-38/M-44/ Chinese T-53 carbines, and Finnish M-39 rifles and carbines. The magazine body is molded from a proprietary carbon-fiber filled black polymer, and utilizes a proprietary feeding system. It has a molded polymer follower for ease of feeding, and a heat-treated Chrome-silicon wire spring ensuring reliable feeding and function.ProMag magazines are designed utilizing modern precision injection molding of Mil-Spec polymer compounds. Every ProMag magazine is backed by a lifetime guarantee against manufacturer's defects. Features: Proprietary and exclusive 7.62 x 54R magazine for Archangel OPFOR AA9130 stock Magazine body Constructed of our legendary high strength, carbon fiber and glass reinforced black polymer Injection molded magazine follower Magazine spring formed from heat treated chrome silicone wire Lifetime warranty Made in USA