The carbon tube with integral shaft guide, has a shape that offers greater buoyancy and stability compared to a cylindrical tube. The shape is designed to reduce recoil in the shot, without compromising its movement. The tube has an ID of 26mm/OD of 30mm, which allows it to be highly compatible with most accessories on the market. Its 2mm thick, 100% carbon walls give it a very high flexural strength. The entire tube is accompanied by an integral track for the shaft. The tube is sealed by two carbon fiber plugs at each end, with the inside being hollow. This tube allows the use of 8mm shaft diameters and withstands high loads without flexing, guaranteeing a precise shot. You can use most of the current components on the market and mount different speargun muzzles. I could cut this barrel down to 90 or 100cm and foam fill it for an additional $15.