Barrel blocks to hold the barrel at the muzzle so I was on the steel end and the carbon fiber. Two pieces of pine 2x4 clamped together then I drilled a 23/32" hole down the "joint line". About the right crush with soft pine on a 3/4" barrel. I can't see any other way.

I did the same thing but drilled a 5/8" hole when I made blocks for the S&W barrel.