In any close-quarter engagement, I consider a standard 12-gauge pump shotgun, in the hands of an experienced user, to be a far more formidable weapon over any AR or AK variant.
Nothing strikes terror into a potential adversary as does the unique sound of a 12-gauge pump shotgun racking a round.
I load my 870 sequentially with #4, OO, OOO buck, and a slug. So, the perp receives increasingly more destructive levels of firepower to his body, if he persists in the attack. I have the weapon set up with an extended magazine tube, a side saddle shell carrier, and a universal sling.
I've head this opinion stated as a fact so many times, when all it does with a hard core criminal is alert him as to your location. You see an intruder in your house don't give any warning at all just shoot.