I think DPMS really dropped the ball on the 3G2... IMO, the 3G1 (which I own and is awesome) is a better rifle. Why?
1.) 3g1 has a 1:8 twist. the 3g2 is 1:9
2.) 3g1 has 18" barrel. the 3g2 is 16"
3.) 3g1 has a ultra crisp 1stage JP trigger. 3g2 has a stock DPMS 2stage trigger.
about the only thing the 3g2 has over the 3g1 is the updated handguard... that's about it. IMO, the 3g1 is a whole lot of rifle for the money! in terms of bang for your buck AR 5.56 rifles, the 3g1 is just as good as the RRA ATH!! I have shot sub-moa all day long with my 3g1 with a vortex 1-4 power scope using 4" target circles at 100yards.