HK G3 and 91 Magazine - Calibers: .308 and 7.62x51mm - Capacity: 20 Rounds - Material: Steel - Finish: Black - Fits: HK 91 HK G3 HK PSG-1 HK MSG-90 PTR-91 Vector 51 Century HK 308 Clones HK 21 HK 13.