Elfster,
I agree with your assessment the RRA Carbine. I own one and other than the Noveske N4 Afghan I own it is the most accurate of all my other 556 AR's and has never failed me. I have an RCOM4 ACOG on it and 5 shot 100 yard groups are alway under 1 moa even with the 4X magnification and my old eyes.