Nightcrawler
It's about tradeoffs. A nice tight DPMS or Armalite .308 will run sub-MOA with the right loads, but they have match chambers and don't like crappy surplus ball.
the armalite 10T has a match chamber chrome moly barrel, freefloat tube, and will shoot sub moa groups with match ammo, I'm told by some owners that they shoot surplus with no feeding problems, but I don't know I've never shot one with surplus ammo,
the standard A4 models have chrome lined chamber/barrels, mines a box stock older model 10A4carbine with the chromelined lotherwhal[sp?] heavy barrel,std fiberglass A2 handguards,
I have a springfield armory G'vt model 6x40mm rangefinding scope mounted,
once it was broken in it is reliable as any battle rifle I've ever had, only more accurate, it'll shoot either match or good surplus with about the same accuracy,
just about 2" for five shot groups at 100yards, and just over an 1" for three shot groups,
even with the india 762x51 surplus crap it'll do 3" five shot groups,
I've shot 12" plates at 500 yards shooting SA 147gr and aussie 144gr surplus with it, the range finder is dead on out to 300 yards, but velocity begins to fall off enough that at 500 yards I have to put the 700yard crosshair at the top of the target to hit center,
I've only shot one of DPMS panther rifles, it had a heavy SS barrel and with the ammo the guy had it was very accurate (sub moa), but had feeding difficulties due to the plastic mag, DPMS is selling 20 rnd steel mags for its rifles now,
price wise the DPMS is several hundred less than the armilite, I've seen the bullbarreled panthers listed online for approx. $850, most of the A4 armilites run $1100+ and the T models going $1700+,
mag prices are the high for both, 10rnd armilites run $25 and 20rnds run $40, the DPMS 20rnds are $40+ also,
what both got going for them is ease of mounting an optic, drop in aftermarket FCGs and parts availability.