Eagle Arms is a division of Armalite - the well known AR10/M15 manufacturer.
I had an AR-10T Eagle. I also had a Medisha 260 upper and the standard national match 308 upper. The barrels were both 26 inches, stainless bull barrels and fluted. The 260 was 1-8 twist and the 308 was a 1-10 twist. Scott set the 260 barrel up to shoot Sierra 107s which I did not like, so before I shot the first round, I rethroated the barrel for the 120 HPBT MK. Both uppers had ajustable gas ports. I used a rubber wedge to stabalize the upper on the lower. An old rifle team trick for the M-16.
At the first outing with the 308 upper it shot sub 4 inches at 500 meters while getting sight settings with the Springfield Armory set trajectory scope. Bang, bang, bang right out to 500 without a miss or problem. I was shooting the Hornady 168 HPBT Match over 42 gr of H4198 for 2517 to duplicate the match load the scope is set for. The load shot .5 inch groups at 100 in a 20k cross wind. Very impressive. Shooting the face painted on the gong at 500 gave me a serious flash back, which I did not expect, at all.
Well, the 260 is another story. It is the most accurate semi-auto I have ever shot, period. The 120 Sierras will shoot into the .10 to ,15 inch range with H-414. I got 3200 fps out of the 10T and .13 inch groups. It is a combination that you can just point and shoot and feel like it will hit the target every shot, regardless of condition or distance. There are some rifles like that and the 260 AR is one of them. The 120 MK can be set to feed in the magazine without the straight sides of the bullet extending below the case neck.
The Eagle AR-10T Green gun is a very impressive piece of machenery and Scott Medisha makes a fine upper.
Now the bad news and why I sold my gun. It is heavy, real heavy. That big bull barrel, fluted or not, weighs a ton. But, If I were paper punching in the military class or in a sniper competition, the 260 AR-10T would be my choice, hands down.
Ed
PS: I buy based on resale at a future date. The AR-10 T Armilite/Eagle Green Gun is the big bucks gun for resale. I kept it for a year and sold it for more than I paid for it!