JP Enterprises chambers some of their rifles in 6.5G. CRAFM has brought some of these in, but not in 6.5G. Not yet anyway. I don't believe that 6.5G chamberings are on their current export permits, but Frank said he'd look into bringing them in. JP rifles are exceptional! If you ever get one, I've got a NIB set of Forstner dies, and 200 pieces of new Lapua brass that I might sell.
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And then there's Sabre Defense............don't know about that though, or get a custom barrel and build your own.. All you need specific to 6.5 G is a barrel, bolt, and mags. Questar has some LMT enhanced bolts in 7.62x39, which will work for 6.5G, and chambered barrels are available from a few + sources.
h ttp://www.saternmachining.com/home