Gen 5 Glock 19 With Holosun SCS-MOS-Gr Optic. The Holosun SCS-MOS-Gr optic is a solar powered reflex optic sight designed specifically for full size Glock pistols monting directly to the slide without the need for an adaptor plate, which places the optic lower on the slide. This pistol is barely broken in with just 360 rounds. Comes with two 15 round Glock magazines. The price new for the pistol was $620, and the optic was $400.