While I haven't purchased my setup yet, I think this should be understood by all interested. The tolerance stacks are not in your favor when using the barrel OD, and the obvious tradeoff is a loss of performance.Clamp on brakes and suppressors must deal with the very real liklihood of bore inconcentricity. They do this by making the exit hole larger than is necessary, sacrificing efficiency. I don't think this is even debatable but certainly, by how much..is.
So, can a clamp on brake or suppressor work? Of course it can! Is it the best..Well, almost certainly, those are not.