The Osprey Global MRS Compact Reflex Sight with a 3 MOA green dot is designed to fit directly on Optics Ready Handguns such as Springfield Hellcat OSP, Canik Elite TP9 SC, S&W Shield 2.0Sig, 365XL Optics Ready, Ruger Max-9, Walther PPS M2 Optics Ready or any pistol/mounting plate/side with RMS/RMSC screw pattern/footprint. Designed to quickly attach/detach from standard size handgun/rifle with picatinny/weaver rails. Now with a green dot.