with a standard tube what stops that set screw from gouging the tube and the brace moving around? I mean their own tube has a divot channel for the screw to fasten to...IF you are saying all you have is a bare tube and you want to add a brace to it, then the KAK blade will fit the oversize tube and you set the position with a set screw.
Rock6, what kind of muzzle device is that on the far left firearm? Never seen one . .. .