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308 just a better manstopper and animal stopper if things get wild.What armor currently is defeated by 7.62x51 that is also not defeated by 5.56? Rifle rated armor is killed by speed over it's threat rating or bullet alloy outside of it's threat rating. Any pistol rated armor will get easily pierced by any centerfire rifle cartridge generally speaking.
Seems to me if people are that worried about engaging armored attackers practicing shooting where the armor isn't is a consistent winner. Waists, and necks/faces generally are never armored even when people are wearing armor, obviously legs too, but I was focusing more on upper body.
Regarding the OP's question about short AR vs long AR. The answer is "yes" - 20inch barrel ballistically wins compared to 16" or 10.5/11.5" AR - but when it comes to working in short distances like that of inside a house, shorter has it's advantages. Sure you can train to be proficient with longer guns in short distances, but you'll be fighting the curve. It's physics - shorter overall length allows for maneuvering faster because less mass is moving less distance, same reason you can move a short stick through the air faster than a longer one.
If you go from being used to a 20 inch to try using a 10.5, you'll be amazed how nimble it seems. Noise will be considerably increased too if that is a factor for you.
If I was fighting outside at extended distances, I would want the velocity of a longer barrel (and a scope). Inside house distances - short rifle is basically made for that. I'd say get one and try it, I have been happy with Palmetto, but many other brands offer short AR's too. Take your pick.
OK, the Springfield Saint 308 pistol. Pretty handy.