Two piece. Barrel channel is formed up with the spray foam, then I lay up CF in the channel. I'm a bit unusual in that I solid bed all my barrels to the forend tip. They always shoot really good, and u don't have dramas with stock warp with composite stocks. I have alum pillar tubes that I epoxy into place, and I mix in chopped CF threads into that epoxy to keep it together. If I had some Devcon then I'd probably use that. But it's not a must have. I've done a couple vertical upright CF cross section at the pillar area too.
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