Ok well i went with the MR556 because im a HK nut hugger now (my mr762a4 shoots like a dream). Tossed a g rail on there and B5 sopmod stock. Put 2 mags through the rifle to get the barrel semi broken in then printed a 1/2" 10 shot group with AAC 77gr OTM (about 2670 fps)
Ran it in the...