Caspian 5.1 - Silver Green Gas Blowback Airsoft Pistol. Very solid and heavy pistol from this Taiwan manufacturer, the Caspian Hi-Capa 5.1 is based on Marui Hi-Capa 5.1's design. Full metal construction with 20mm lower rails for installing accessories such as flashlight & laser unit. Extremely smooth and realistic slide cycling action with strong recoil. Lead content in slide makes it extremely heavy and solid with a strong kick during blowback.