Took me less than a minute to find barrels for sale in the US, for around forty bucks. Google 'west hurley gun parts'.

If you were here in Canadaicon, I could spin one on for you not a problem. Adjusting the headspace is the killer, you need a handful of different length bolt heads to find one that works.

Or, find a brand spanking new one with 'S' stamped on the underside. These were overlength for use by armourers who would stone them down to fit specs. Chance of finding one is slim to none, but ya never know until you look.

Keep that one the way it is. Then you have justification for buying another one with rifled barrel