I confess that I changed the barrel on my Dan Wesson M-15 using the older
style wrench with separate barrel plug, then fired the plug down wrench, had
to hacksaw off the barrel shroud and barrel and replace them. A short time afterwards read in one of the gun magazines where one of the "experts" admitted to doing that, then I didn't feel so bad. The newer style Dan Wessonuzzle wrenches are one piece tools, a much better design. And I did
buy a spare barrel for my 9MM Browning HP, when I fired it I wondered why
the cases were expanding so much, yes it was a 40 S&W barrel.