There were several old Winchesters made with short barrels. They are legal to own but he needs to research the gun to make sure it's factory original and then he might have to get the ATF involved. If I had one of those old rifles I'd do everything I could to make sure I kept it that way. Pretty rare and valuable guns.
In short, I'd tell him to do legwork proving that his gun is factory original and then call the ATF to get a letter stating that.
In short, I'd tell him to do legwork proving that his gun is factory original and then call the ATF to get a letter stating that.