(Colt has PC'd out on the 'evil' features and will only offer a version with pre-ban features to law enforcement)
Very little recoil. Itsy bitsy little bullets.
Plastic tipped varmit rounds are no more penetratating than 40 S&W but much more devasting.
Actually, I'd get 3 weapons. A large, accurate, pistol. A small innaccurate but concealable pistol (the 38 snubby (with an Uncle Mike's pocket holster))and a long gun such as a shotgun for the bedroom. But hey, the m4 is pretty sweet too.
Can I get that at Sears?