Carbon Fiber Barrel
A barrel built from a thin steel liner wrapped in carbon fiber, cutting weight and shedding heat while keeping a full-diameter profile.
A carbon fiber barrel pairs a slim steel liner, the part that actually contains the bore and pressure, with a thick jacket of carbon fiber bonded over the outside. The liner is usually the same stainless alloy used in a conventional stainless steel barrel, but turned down thin, with the composite supplying stiffness in its place. The result is a full-looking profile at a fraction of the weight of solid steel.
The big draw is that weight saving, which makes a heavy contour practical to carry, and many makers argue the carbon also helps the barrel shed heat across a sustained string. It is one of several ways to manage mass alongside choosing a lighter barrel contour or cutting a fluted barrel. Carbon-wrapped barrels cost considerably more than plain steel and still depend on the quality of the liner inside.