AK 762x39
AR 5.56 aka 223
M1 762x51 aka 308
They make AR's in 9mm , 6.5 , 6.8 , 762 , 300 black out , 50 beowulf , etc ,and they also make AK's in 556
And what do you mean by accuracy? bench shooting with match ammo or just being able to shoot man sized targets? either way your estimates are low