Preface: Though many of you may disagree, for myself I define SHTF as when Law Enforcement stops existing throughout all of the United States and I don't have to worry about legal ramifications about shooting someone who is breaking into my apartment or trying to attack me. Thus for myself personally, I wouldn't consider Katrina, SHTF, not that having a gun or rifle on hand during Katrina wouldn't help. I have never really fired a gun, rifle, shotgun, etc., and totally realize that a person would be a fool not to have one in situations when Law Enforcement no longer exists. My question is what is the best weapon to have on hand if you've never used a firearm that would help protect you/fend off a group of people trying to break into your home and taking your resources when the SHTF? Offhand, it seems like an AK-15 or is it an AR-15, would be extremely handy but perhaps not for someone without experience. Thanks for your input.