I have owned 4 "AR-10s" including an Armolite. One was a Bushmaster, one a DPMS and one was a K.A.
None were reliable. I wish they were, but saddly they were not.
I could NEVER get through 4 magazines with ANY of them without a jam of some sort with any ammo, and I did try many types of ammo.
I have an AR-15 in 6.8 SPC that has never jammed one time in the 9 years I have owned it. It has had about 4500 rounds through it so far.
So if you want more power than is available with the 5.56 and you want the rifle to WORK I’d have to recommend the AR-15 in 6.8 SPC. I also recommend a reloading set-up because the ammo is going to be hard to get in comparison to 308 or 223. But that's not a problem if you buy a few thousand cases at the time you get the rifle.