I just took an old donor gun into McGowen Precision Barrels for a new barrel, chamber, and fit up etc. The cost is going to be much less than a new rifle off the shelf and they tell me that I will have a 1/2" gun. My total cost is about $500 or so. Thats for stainless and fluted.
You can go to their web page and they list all the services and prices they offer.
Also they are giving me a turn-a-round time of about a month.
Mine is not done yet so I can't comment on how it turned out, but for the price it seemed like a no brainer to me.
Good luck, Steve
To hunt... or not to hunt...? What a stupid question.