Military doctrine holds sway on comparisons of the AK-47s and AR-15 rifles, with each tactical rifle making a solid push into other shooting disciplines. Riflemen are soldiers trained to use a rifle and find both weapons competent.
Both guns are highly accurate out to about 350 yards; 500 yards if you have good aim. The AK was designed to fire thousands of rounds by an untrained peasant army with questionable marksmanship skills. The poorly aimed firepower was meant to get in close and spray the enemy with bullets.