We won each and every fire fight against those who carried AKs, our assault rifles were far superior (variant of the M4 called the C7A2).
https://www.google.ca/search?ei=VeA....1..gws-wiz.......0i71j0i67j0i131.Lez-m8bZncI
AKs are everywhere as many countries copied them and they were (are) cheap to make and obtain.
The 7.62x39 rounds they use are a short range round only really decent at 100 meters or less. They carry a good punch though but their muzzle velocity is lower (2350 fps)
Yep, I'm not that up and up on the estimated ranges of different calibers and specific ammo, but I know the AK's don't have the range or accuracy of a .223 or many other calibers.
Just that their durability and short range knock down make them desirable(and it does seem that their popularity took off long before any decent competitor was readily available, making them a standard for many)
And personally I find them fun to shoot.
They do have more of a pop and the barrel end jumps up(making it hard to stay accurately on target), vs traditional reward recoil.
My gun knowledge is limited to handling, securing, cleaning, loading, and firing safely.
I own several and have shot many.
I have friends that are like you guys, walking encyclopedias, knowing histories, interchangeable parts, best ammo per application, etc.(just wanted to clarify that so no one thinks I'm talking over my head...and you may at times have to dumb it down for me, lol).