Calibers: 9mm, 45 ACP. Capacity: 17- or 20-round (9mm), 13-round (45 ACP) double stack. Barrel: 5”. Weight: 40.9 oz. (9mm), 40.1 oz. (45 ACP). Length: 8.5”. Sights: TAG FiberLok 2 Red front, adj. rear. Optics-ready. Features: Stainless steel frame, ambi safety, aluminum grip module, GT match-grade trigger. OR model is optics-ready, the OI model has a factory-installed Trijicon SRO optic (add 22%).