There is no need to cut barrels back to install screw-in choke tubes. The basic requirement that determines whether the procedure can be done on a barrel is the wall thickness at the muzzle. Some are just struck too thin, even for Briley thin walls. And, I have seen some that Briley did that I would not want for myself. After boring, and threading, the barrels were so thin in the choke tube area that I'm sure you could have bent them between your thumb and forefinger. A bump on a hard object, with the choke tube removed, would be disastrous. You could actually see the thread pattern on the outside of the barrel.
SRH
