Rob Allen Aluminum railbarrels have the same dimension as the carbon barrels. The rail level lines up with the profile of the mechanism and the muzzle. The integral rail is part of the barrel, thus increasing stiffness and reducing flex. This makes the guns deadly accurate.The rail barrel is made from aircraft grade aluminum with a wall thickness of 1.45 millimeters and the mechanism is made from glass reinforced nylon and has a solid 316 stainless steel sear.Rob Allen Vecta Aluminum Railguns are available in lengths from 0.7 meters to 1.4 meters (70 centimeters to 150 centimeters)