Re: Stag Arms Model 3G
i think the most attractive parts of the Stag 3G are the Samson forearm, the Stainless & fluted barrel, and the Dueck Defense sights (optional for an extra $250 or so)
i just finished building my AR with a Palmetto lower, CMMG kit, MOE stock, Troy Battle Rail Alpha forearm, and a 20" Sabre Defense fluted Stainless barrel. i built mine for $800 with the hand-me-down barrel from a friend with less than 200 down the tube.
my "custom" AR is really, REALLY accurate. with some Magpul BUIS at a 45* cant on the forearm, i got away with Dueck style at a fraction of the price (also, BUIS were used and free)
all i need is a quality optic. after borrowing a nice 3-9 from a friend, i've decided to go with a Vortex PST 2.5-10 scope, whenever it shows up.
my .o2? the Stag is a nice gun if you wanna grab something off the shelf. the DPMS is also nice, but doesn't feel as well-made as the Stag. and as far as an AR-10? for casual shooting, i'd personally go with the 5.56 for cheaper and more plentiful ammunition
IANAL, YMMV, and remember what you paid for this opinion