It will not be a pressure bearing component. The barrel is cut off directly in from of the chamber (and the welded on barrel lug) and is then bored out and threaded. A new barrel of different caliber is threaded in. It is purely cosmetic, even if it wasn't the lug is already welded on. ( H&r/NEF...

I have a shotgun barrel that I believe to be 1137 mild steel but i am unsure. I need to weld up some stamped lettering on the top. I am a relatively new welder and was hoping for anything I should look out for. I need to use 3% nickel rod because it takes rust bluing in a similar way to base metal. ...