blusam, I have not tried the perfectunion, but i did give accuracy systems a try. The site that nibbler posted is where I sent my rifle. They did a great job. very fast and nice work. give them a call and talk to them. a total accuracy job will run around 850.00. new gas block, new barel, new trigger and glass bedded.
It will not shoot with the ar, accuracy is around 1.5 moa. It may get better after it is shot a bit as most rifles do. I have about 100 rounds through it.