It was the 2nd factory .308 gasser I bought after selling my ArmaLite -10T 24" (whoops-.3 MOA gun, a hummer).
I initially had the extractor fail right out the gate on the LR-308 24" bull barreled beast. It weighs more than a SAKO .338 LM TRG.
I think DPMS's approach with them was stuff as huge of a barrel in there that will have less flex to get accuracy for cheap.
The rifles they would send to writers would be hand-select tack-drivers from a lot, while mine was maybe a 1.5" gun with Lapua brass, Lapua bullet, consistent load of extruded powder after accuracy work-up.
I had a lot of FTExtract with it even after the new extractor was installed.
Chamber was more like a minimum bolt gun chamber, had it reamed so it would run reliably.
I learned a lot of lessons with that rifle for going to my next project with GA Precision. I just sent them receivers, BCG, a handguard, RET, buffer, recoil spring, LPK, and asked them to spin me up an Obermeyer pipe, 22", fluted, true everything and cut me a chamber for the 155gr Scenar mag-fed from 2.800" COL. It was hard to find targets small enough to kill with that rifle. Placed 2nd with it in FinnSniper 2008 with my British Royal Marines partner (he was shooting an AI in .25-06 with Bergers).
We both went to 6.5mm after that, him a 6.5x47Lapua, and me a .260 Rem.
If all you want is to make holes in paper, .223 Rem is plenty for that, does better at it than .308 Winchester from a gasser at closer ranges. Much easier to shoot, very forgiving of technique, easy to follow-through, easy to feed, no real recoil management needed.
Your fundamentals have to be perfect with the AR10 or else it will refuse to reward you. The tiniest amount of slack in your technique will result in opened groups.