I WAS always a fan of OLY Ultramatch uppers, because, with the right ammo they would produce sub 1/2" groups at 100 yards, but, I needed the barrel replaced and they supposedly replaced it 5 times in the last 2 years, before I finally got a good one.
In the meantime, due to the frustration with Olympic, I settled on a Gator. It is really neat looking, and they were running a special for USPSA members of $599
My buddy saw it, and HAD to have one too. He has three other DPMS ARs, including the varmint. They all shoot o.k., but, not spectactular. I think some of the best groups I saw out of his DPMS was about 5/8"
Without doing any load development, he is getting sub 1/2" groups with his Gator.
I LOVE my Gator, between the JP gas system, and the comp, it is the softest shooting .223 I have ever shot, but, I am having some accuracy problems with mine at this time. The general consensus is that the barrel nut is loose. I will be getting it checked next week.
All in all, I WOULD reccomend a Gator!
P.S. The two we have seem to like Nosler 55 grain ballistic tips, Hornady 60 grain V max, Hornady 68 grain hollowpoint match, and Nosler 77 grain hollowpoint match. I have shot 1/2" groups at 200 yards with the 68s, and 77s.