i have a few bushmasters, they all are sub moa, most WAY under
Bushmaster has made rifles for the military and they have been very reliable... i wouldnt trust Colt
as far as RRA or Bushmaster, there both good, id prefer Bushmaster
i havnt yet fired RRA but even my Bushmaster M4 Carbine gets down around 3/4 MOA, my 20" target model (w/ hbar) shoots much better and my varminter puts factory ammo through the same hole at 100y
i vote Bushmaster... they cost $100 more than RRA though