I will catch hell for this but if anyone wants to argue is fine by me.
Basically it's like this- if the rifle is headspaced correctly and the barrel is good- then there is no reason an AK in 5.56 will not shoot the same as an AR15 if using the same ammo. Once the bolt is locked and the round is fired- there is no damn difference in accuracy. If there is then it is only because one is DI versus the other being a piston. However sights are the actual culprit in the age old AR vs. AK accuracy debate- but if this is an issue just throw a set of Kreb's peep sights on your AK. Then there is the classic IMA IDIOT FUDD argument that 7.62x39 can't hit the broad side of barn, try bench shooting the rifle, maybe use an optic or a peep, and of course use quality brass cased ammo to see what happens. Milled guns are stated to be more accurate but again, as long as the bolt is locked then it makes not difference because the trunnion is milled where the bolt locks up.
Things that will increase accuracy for any AK owner; peep sights, quality ammo, optics, bench shooting, and practice.
RR