Might have to try this. I could do the radius cut in the mill too.
Need to figure out a way to do something similar to my 551 SBR too. Its a bit gassy, even with a modified gas valve
Commercial tubes are larger OD, because it makes them considerably cheaper to manufacture.
So a commercial stock would probably fit on a mispec tube, but it rattle all to hell.
I think they do it for the Form 1 can guys that dont have a machine shop. We have thought about making an 80% can but dont really want to open that potential can of worms