Holosun SCS 320Long story short: Holosun SCS 320 is a red dot sight made to fit SIG Sauer P320 models without need of any mounting plate. It will fit the optics ready cut as it comes. It has green reticle with 2 MOA dot and 32 MOA circle. The SCS 320 GR (Solar Charging Sight) is designed for P320 optics ready handguns or other DPP footprint applications. It is designed to attach directly to the slide without an adapter plate and uses our innovative solar charging