I have a RRA that I have had for several years now and it works well, I do think you have to play around with different ammo to see what they like to shot the best. My RR will shoot good black hills and hornady well, but when I run cheaper ammo through it the accuracy is very sub par, I also purchased mine before they got their gov't contract and I have heard through various sources that since then the quality has diminished some. I have shot a bushmaster, and a colt and several DPMS'. I'm gonna say that ultimately its up the the puchaser what AR you want and YES there is a ton of stuff you can put on them if you want. As soon as I get the funds I'm gonna upgrade to a LaRue Tactical, my opinion is that they have a lot of good stuff going for them, and for only $400 more than what my RRA was. I have also read a lot of good reviews on Noveski's.