Then I don't know where the mix up came from. To put things in context, I know that your not a complete newbie to firearms, so I didn't understand why he thought you would think that a .308 or 7.62x51 would run in a 7.62x39, which is what he was talking about (... I think?) when he said:
your not going to find a AK in .308, .308 is 7.62x51 NATO and will not cross under any circumstances with 7.62x39 short russian.
I think I'm understanding now. When I'm referring to 7.62, I'm referring to NATO not Intermediate. I think when I typed "7.62 NATO", and then later, abridged it to just "7.62", he might've thought I was talking about Intermediate.
Just to clarify, I am referring to 7.62 NATO in all of my posts.
Does this change anything now?
I believe 7.62 NATO is higher pressure than .308... which, when I first read that 7.62 could be fired through .308, I thought it seemed amiss. However, I read multiple sources that said you absolutely should not fire .308 through 7.62, but that it was safe to fire 7.62 through .308. One opinion was even careful to mention that it was the exact polar opposite of interchanging 5.56 and .223.
My friggin' head hurts, man.
My qualms are these: I just don't want to buy a rifle that I will not be able to find, or afford, ammunition for. That's it. I want the rifle that is going to allow me the most ammunition options at the best price.
If they come to out to be even, then I'd be tempted to take the AK because the price of the weapon itself is buy half of an AR/M4... plus it has greater stopping power. But then, as you pointed out, the flash could be an issue. I'm not much for giving my position away... nor being blinded by a 6 foot fireball when night firing.