Quote:
... you'll find that one of the safest rounds to use, with regard to NOT penetrating multiple interior walls, is 5.56mm (as long as you avoid the rounds specifically designed for penetration).
Standard 5.56mm from a carbine or rifle will typically come apart when it hits a wall, losing almost all its energy.
It penetrates less layers of drywall than a shot pattern will (assuming the shot pattern is still relatively tight).
So, if I were worried about a duplex or condo environment, I'd probably go with a reflex-sight equipped AR.
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This is quite sound advice. Fragmenting round in 5.56 are commonly available at Wal-mart too, if you want to take the extra step of caution but will still be more effective against an intruder than birdshot due to hydrostatic shock. The shorter barrel, lighter weight, higher ammo capacity of an AR gives it a huge advantage over a shotgun, and the power levels are much better than nearly all handguns. Rubber bullets and bear spray are likely not going to be particularly effective in stopping a home invasion.