a few points to ponder,
statistically more people have been killed by accident with a .22 than any other gun.
you can carry a butt load of ammo easily, take your pic, 1000 rounds of 22 or 180 rounds of 556 (basic military load) (6 mags)
and you can actually afford a thousand rounds of .22 ammo.
if I was a bad man with a AR, and was looking for food or money and you had a .22,,, I might look for someone else that does not have a .22
if your in anything close to a fair fight, your tactics suck.
I am Iraq vet twice (11B Infantry) been in some bad situations, and something that really didnt cross my mind was how big is the gun that is shooting at me, it's a gun shooting at me, that was all I needed to know.
you are fighting Humans, not lions, you shoot a lion with a 22, he will charge and kill you, you shoot a human, he will stop and seek medical attention (normally)
as you can tell I am a big fan of the 22, I personally went with a 22 MAGNUM
Magnum research 22 magnum semi auto
Leopold 2-7x28 scope
Volquartsen 25 round Magazine
Volquartsen extractor
Extended Mag release
polyurethane bolt stop
and I got a Docter site and am about to mount on top the scope for quick target acquisition, and see if I like it.
