Don’t bother with carbon fiber.
If you get a nick or abrasion on it, the first time you run your hand over any fibers that are cut and sticking up from the surface, you’ll be wishing you had bought aluminum.
CF also isn’t something you can re-finish, should you ever wear off the outside finish.
Overall, I really don’t see the point for CF on guns. To add stiffness to a wood stock, sure. But to make a receiver or front tube out of one? It’s a solution in search of a problem.
Carbon fiber is really nasty if you try to sand or machine it. It will tear up your lungs and if any pieces get under your skin you’ll have a very tough time getting them out.