an m16 (ar-15 in civilian version) or other military style weapon is useless for home defense.
The shorty or CAR or m4 I think they're calling it now is a decent (not excellent but decent) CQB weapon...but you must train and know how to use it effectively. It takes at minmun 10000 rounds through the muzzle to become proficient enough to be considered mediocre.
cheers,
-bear
DO I STRESS the train train train train train train thing enough
Just want to be sure.