The only tight fitting carbon sleeve I have used I glued on, this was done because the barrel was scruffy, I don't know if fitting the tube affected the zero but it was never going to rotate and cause me any shift problems. The larger dia one I have now also has a screw in it to prevent rotation so once zero'd it stays put. It has been on a month or so with no issues.
HFT, for people with only 2 buttucks!
VooDoo TwoTwo The next chapter.