www.odcmp.com
Go here and check them out.
Yes there are two thing to be aware of when buying a M1 rifle. The demiled or re-welds are the biggest risk. Century made are the next. Century have a cast, sometimes poorly, with GI parts. And of course there is the Springfield Incorporated, but you won't be getting one of them for $600 unless it flat out doesn't work.
A set of gauges or a trip to a gunsmith before buying is a good thing too.
The CMP was selling their Greek returns for $295 a few years ago and a lot of them were rough looking but mechanically sound with good barrels. The CMP stopped selling them so cheap when they saw too many posts on sites like this about what a great deal they were.
