Calibers: 9mm, 38 Super, 45 ACP. Capacities: 7-, 8-, 10-, or 16-round. Grips: Hard rubber or G10 grips. Barrel: 3.6”, 4.25”, 5”. Finish: Blued, Duracoat or two-tone finish, matte stainless, or nickel. Sights: Post front, fixed or adjustable rear. Features: 1911-style semi-auto pistol. Rock Ultra has fiber-optic front sight and adjustable rear sight. Some with doublestack magazines. Values are for the Rock Standard model; add 9% for the Rock Ultra variant.