This is a 30-round magazine for an AR-15 7.62x39, and is constructed of stainless steel. This C Product Defense replacement magazine is for AR-15 rifles chambered in 7.62x39mm. Holds 30 rounds and is constructed of 400 series stainless steel. The black follower is pushed up by a Wolff 5% extra power carbon steel wire spring. Weighs 7.36 ounces. Specifications and Features: Caliber: 7.62x39mm Capacity: 30 Rounds Material: 400 Series Stainless Steel Follower: Black Spring: Wolff 5% Extra PowerCarbon Steel Wire Weight: 7.36 oz Finish: Matte Black