Titiaq is dead right Ken. I did what he suggested on a .22" CNo7 at Warminster that had the barrel cut back just behind the bayonet lugs. Used a length of off-cut No4 barrel muzzle. Just stepped the original barrel under the block, band foresight and undercut the new section with a .23" smoothed muzzle. Soft soldered the two together and they alighed perfectly by means of the foresight block band lugs. The join is just like Elton Johns wig. Invisible
You could just wrap 'em up and send 'em to me................