I'm new to them, but have gathered that AR is most common in .308 and .223 with a broad range of other calibers. The AK is pretty much 7.62mm. I could be way off though
.308 is top of my list, but want to see what other opinions and experiences are out there.
Ammo availability is also a factor, I don't want anything I can't readily get at the local shops and big stores.
I would also much rather an american weapon, so I guess the AK is a non contender?
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