As for longer barrel life, there’s plenty of disagreement. C-F barrel makers say that their barrels cool significantly faster. However, there are other sources who claim that carbon fiber conducts heat much more slowly than steel. These folks claim that a C-F barrel will actually store heat unless the wrapping is done in such a manner as to release it, and that the bonding agent must conduct heat outward, which epoxy does not. You can put your hand on an improperly made C-F barrel that’s been shot a lot, they claim, and it will feel cool. However, this means that the heat is still lurking inside, and if the hot steel liner expands at a different rate than the fiber surrounding it, you’ve got trouble.