Originally Posted by chrisbaker42
Guess I'd better stop listening to the gunsmith at Neath Gun Shop.
Yes, you had.
The muzzle brake on the FTP is a completely separate unit to the barrel shroud. You can take the shroud off and then refit the brake and it will still do its job.
The shroud itself is actually two tubes, one that fits into a recess at the back of the muzzle brake and into a recess in the figure eight, held with O rings either end, and the second that fits between the figure eight and the breech, again with O rings. At the breech, there is nowhere for air to pass, because that is where the barrel is fixed into the action.