The contiguous state thing was eliminated a long time ago. he should beable to buy in CO and in an appropriate case check the rifle through to GA. Check the TSA and airline regs so your set up properly when you get to the airport.

Oh and hope you don't get a NICS delay

The collection of taxes which are not absolutely required, which do not beyond reasonable doubt contribute to public welfare, is only a species of legalized larceny. Under this Republic the rewards of industry belong to those who earn them. Coolidge