CMP would be your best bet.they now work on garands.a criterion barrel is just under 200. Then you need an action wrench,pull through chamber reamer(you can rent),and a barrel wrench.just for one rifle you would be far ahead to let cmp do it for you.I forgot gauges too.
I would stay away from the itallian 308 barrels.I think they were cut down and re-chambered.hand guard and op rod are shorter too.just my 2cents