I wanted to build a cheap one. 400 bucks with delta team tactical. A 7.62x39 would have cost me more. It's my toy. I like it when my ears are ringing and fire shits out the barrel. If shit went down here I would grab my 7.62. That you can count on.
7.62x39. Sorry. I had to. IV8888 did a good video on 7.62x39 vs 300 bo. Anyhoo....at close quarters I'd rather have more lead. I would take the 300. I only have one 5.56 and it's my pistol.
I have enough ammo to last a day or two. I am ammo poor. With everything going on I haven't bought any ammo for my AR10 yet. I own a cool chunk of metal that I can club you to death with.