The Airsoft Masterpiece 'RIO Carry Optic' 5.1 Custom Slide is a lightweight aluminum constructed custom slide set that is designed for the Tokyo Marui Hi Capa / 1911 series gas airsoft pistols. The RIO custom slide set has lightweight cutouts and it is an RMR / Docter red dot sight ready, allowing you the opportunity to run optics on your Hi-Capa / 1911 series gas airsoft pistols.