Brad, that was my question as well. However, after some research, the A5 block with the adjustable gas regulator is the gas block that is press fit and shrunk on the barrel. Every photograph I have found of the vented 10.4" gas block shows that it is pinned with the two roll pins like the earlier non-vented gas blocks. So unless there is some change in the internal dimensions of the gas block, the new style should fit on the barrel. When I get my block, I will post photographs compared to my old non-vented block as well as installed on one of my 10.4" heavy profile barrels. Fingers crossed!