Rob Allen Carbon railbarrels are pullwound in a continuous process using 3 to 4 tons of tension. This allows the fibre loading to be maintained at a much higher level than in conventional mandrel wound tubes as used by other manufacturers. As 100 % carbon fibre is used at the highest possible loading, along with an integral rail further adding to the stiffness, the Rob Allen Carbon railbarrells are the best in the world. Each barrel is pressure tested twice – first with air immediately after the initial pullwinding process and then after assembly in our hydraulic test chamber to the equivalent of 40m depth for one hour. The Black Glass reinforced Nylon mechanism comes standard with a Stainless Steel Line Release. Designed with Carbon Barrels in mind, the internal spigot and external shrouds grip the barrel to avoid stress at the screw holes.