Personally I would try an FN for a gov 20, or a Colt if they make one. I have owned 3 BCM 20" Gov uppers. They appeared to be of very good quality. Accuracy was about 1.5 - 1.75 MOA with match ammo. Only shortcoming was they were not functionally reliable with the S&B 55 grain 223 ammo as short stroking was a problem.
I do plan to buy another BCM in the future, but it will be a 16" mid which I have experience with already and have found to be 100% reliable with everything I have tried, and accurate with the BFH barrel.
RRA doesn't make a gov profile 20, it is a HBAR. In my experience they extremely accurate at ~ 3/4 MOA, some better. I have also found them to reliably function on everything I ever tried, 556 and 223.