The Elite Force 14rd 1911 Co2 spare airsoft magazine by KWC is made from heavyweight aluminum, giving a hefty feel to the 1911 airsoft pistol. This Co2 Elite Force magazine has a high-efficiency internal gas system providing excellent FPS output, and reinforced valves and seals for optimal gas retention. We recommend using Valken 12g Co2 Cartridges with this gas pistol magazine.