I just got one of those little 12"w/shroud tac sol barrels myself. Waiting impatiently for my form 1 to clear so I can pull off the dummy and get to work.
I assume they do shift a small bit, but as long as the shift is less than 1/2moa, I don’t believe it matters all that much; given the intent of a takedown semi-auto. If the shift is over an inch at 50 yards, then the system has problems