The Rock Island Armory Rock Ultra is a full-size, single-action 1911 chambered in 10 mm Auto. Finished in Flat Dark Earth Cerakote over a steel frame and slide, it features a 5? barrel, brown G10 grips, a fiber-optic front sight with an adjustable rear, and an 8-round magazine. It weighs 3.7 lb and ships in a hard plastic case. Firearm Specifications Manufacturer: Rock Island Armory Model: Rock Ultra Caliber: 10 mm Auto Barrel Length: 5? Overall Length: 8.5? Twist Rate: Not listed Finish: Flat Dark Earth Cerakote steel frame & slide Sights: Fiber-optic front / adjustable rear Grips/Stock: Brown G10 Magazine Capacity: 8 + 1 Item Number (MFG Model No.): 51825 UPC: 4806015518259