This is a Glock model 45 semi-automatic pistol in 9mm Luger caliber. It has a 4" barrel, MOS optics ready slide, fixed elevated sights, light rail, interchangeable backstrap inserts, and 17-round magazine capacity. This pistol comes with an Aimpoint ACRO red-dot sight already mounted! It is in nice condition with a clean, bright bore. It comes in the original plastic hardcase with manual, cable lock, cleaning rod, bore brush, 3 magazines, 3 grip inserts, and loading tool.