I wouldnt let a machine shop do it. Welding generates a LOT of heat in a small area and if not done right can damage a gun barrel.
Consult with a gunsmith in your area on what minimum is acceptable to your slave masters. Some slave states allow their slaves to use solder or a light tack weld.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent