I'm not super impressed with the carbon as it wants to fray a bit. I made a collar for the muzzle that I will shrink on. I have zero interest in a muzzle add on. I don't want a long rifle.
Dunzo! I shrunk a collar on that I made from a barrel stub and matched it. I made some .025" cuts in both directions as fast as I could feed and it didn't budge. HOPEFULLY I don't have to lap the muzzle, but it was only. 0015" tight. Time to test drive it.