Oh Jesus, where to start.
First, a Shotgun is at just as much risk to penetrate as say, a 9mm or an M995 AP round when it comes to dry wall.
Second, an M-16 or AK-47 or other such weapon, works just fine for home defense, considering that each shot can be used to precise effect, or you could go all out with a high volume of fire, eliminating multiple attackers.
Third, a 5.56 SS-109, or, what is more likely to be used in home defense, soft-grained M-193, is likely to completely destabilize and break up on impact with cynderblock (or veer off in a random direction shedding enough velocity and mass to be relatively harmless. M855, or SS109, is NOT armor piercing, despite what some gun rags say. It has a steel penetrator tip for use in the SAW, but it doesn't actually have such increased terminal ballistics as to have a justifiably different applied value in defense terms. In short, it's just expensive M-193 with a pickier rifling twist.
There are cases of armored assailants who got up immediately after taking a #00 pattern shot to the chest, and blew the defender away while he was working the pump, so it doesn't always work.
A Short-Barreled full-auto is an interesting prospect, such as the HK MP-7, which is designed for ranges like where home Defense typically occurs. Overall, I'd go with a PDW.
Now, given I don't know much about the layout of your home (someone I've talked to has the kind of home where a Shotgun would NOT be the ideal weapon) I'd have to say, in general you're better off with a shotgun, loaded with a tight pattern, and a good, 18" barrel. So #00 and 18" might work to good fitting, but you need to get used to the weapon first. Now, supposing you had a large home, or one with an open layout (a relatively small home might be 100 feet or more from one point to another) and I'd rather give a man a good semi-auto and soft-tips and make a mess of the assailant.
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