That's an excellent question Dude and now gets us back to the right spot. KOD asked a question and
@orkan made a statement based on his experience and because he's been run through the mill here in the past, he chose not to elaborate. KOD is a good Dude and I don't want to see him sent down the wrong path, so I chimed in with an experience based opinion, and that is, even with perfect threads, a bushing isn't the best way to approach re-barreling KODs action.
I get it that Mr. Penrose (I don't think that's his name) "said he was impressed," but did he make that statement here himself or does anyone have any further context to what that means? No, he didn't, so no one really knows what Mr. Penrose said except KOD.
So, as it relates to improving a rifle at the price point of the B14R, it makes sense to eliminate a component that serves to promote the stacking of tolerances where the process of properly fitting a barrel is concerned. Factually, it's difficult for anyone to argue that, perfect threads or not.
MB