The Beretta isn't stamped sleeved because it's not sleeved, Gunman.

As you point out, the barrels are soldered into the monoblock in the first place. The action is heated red hot, the barrel stubs are inerted, and when the assembly is cooled there is an interference fit.

To rebarrel, there is no 'cutting off' involved. Heat, pull, replace. No change in weight or dynamics because the thing was made that way to start.

I'd call your sleeve job on the Beretta a 're-tube'.



"The price of good shotgunnery is constant practice" - Fred Kimble