I have three Vepr AK rifles,,,one in 308,,,one in 762x39,,,and one in 556. Just this last week I shot the Vepr 308 at the range,,,groups at 100 yards ranging from one to one and one half inches,,,granted with a 3x18 power Leupold scope set on 18 power and 168 grain Federal Gold Medal Match ammunition,,,the rifle could probably do better,,,I am 64 years old and have eye floaters.
I bought a bunch of Lapua 762x39 ammo and have 556 match ammo and with a high magnification scope I will be testing the accuracy of the Vepr 762x39 and 556 rifles which are made in Russia,,,and I expect them to do one to two inches at 100 yards or better.
This is in the neighborhood of my FAL, M1A, PTR91 only my AR10 and AR15's shoot slightly better.
In research of the AR10 platform most manufacturers are quoting 1 MOA,,,only GA Precision in an AR10 quotes 3/4 inch and Les Baer in an AR10 quotes 1/2 inch,,,even GA Precision's best bolt gun quotes 3/8 inch at 100 yards.
So as the video states generally a good AR will be more accurate than a good AK,,,but then the video goes on to quote reliability,,,without going into that debate,,,generally tighter tolerances mean greater accuracy and less reliability and looser tolerances mean less accuracy but greater reliability,,,so any rifle is a compromise at both.
My final conclusion,,,I will keep both my AR's and my AK's!