Ok, so AR guys were jealous of the penetration power (ooh, innuendo!) of the 7.62x39 round, so they tried to get it to work in ARs...
too much taper made the mags unreliable
bolts were weaker due to less meat in the lugs
dirty ammo gummed up DI rifles
so somebody invented 300 Whisper, and then 300 Blackout- imitating (and yes, improving) the 7.62x39 round ballistics.
People explored the suppressed firearm capabilities a lot more (since .308 bullets are more available & varied than .310 when reloading 7.62x39
AKs have been available in .223/5.56 for a while, nice to have variety that can shoot the same cartridge as your AR, right?
You can even get magwells and mod the rifle to take AR mags!
so now we have gone full circle:
http://ak-builder.com/index.php?disp...oduct_id=30555
a barrel to convert your .223/5.56 AK into .300 Blackout! Granted, 1-in-10 rifling isn't ideal for subsonic rounds, but a suppressed AK won't near as quiet as an AR (unless you suppress the gas piston system, too)
But you can now build an AK to fire the round that was designed to imitate the round the AK was originally designed for!![]()