There is no one gun that is perfect for everything. A 12g shotgun - in it's envelope of effectiveness - is THE number ONE manstopper period.
Say what you want; Take an AR and a 12g and shoot 100 BG's with each. The 12g will STOP significantly more, and more permanently. The AR fanboys will tell you how an AR can do anything from killing a squirrel for food at 1000 yards to stopping a vehicle at 30ft. Whatever. .223 moving at high velocity is as likely to pass clean through a target (particularly up close) as it to tumble, ricochet blah blah blah...
As for 30 rounds - how often are you going to miss??? And what is the cost of a miss in the home or in the neighborhood?
A rifle is not an ideal weapon indoors period IMO. Not saying it can't work, or won't work. But small cal high vel .223 rounds are not my first choice for target within 30ft, that might shoot back.
A Shotgun has an AWFUL lot going for it indoors. And in SHTF, the flexibility of the ammo for hunting small to large game from 0 to 100 yards, on land or on the windy, is unbeatable.
As mentioned - the AR has it's benefits like moving from a down the hall to a down the street shot.
Last edited by Aceman; 02-24-2013 at 20:32..