This GLOCK 45 is the perfect combination of compact slide length, Gen 5 features, Model 17 magazine capacity and now MOS plate compatible slide so you can mount up your favorite micro reflex sight. The GLOCK 45 with MOS (Modular Optic System) optic plate mount is powered by green gas and compatible with existing magazine SKU numbers (GBB) 2276347 and (CO2) 2276348. With full blowback operation, this GBB launches .20 gram BBs at 300 FPS and has an ambi slide stop, and reversible mag release. With MOS optic plate kit SKU number 2211388, you can mount the micro pistol optic of your choice to the slide of this GLOCK 17 Gen 5 MOS.