I would go with FerFal's advice on this one. An AR or AK would certainly keep a couple of guys safe with enough magazines and ammunition wouldn't it? There is nothing like force equalization from a large magazine in your rifle to protect your home.
"Freedom ain't Free" Ted Nugent at the House of Blues in Orlando.
"Both oligarch and tyrant mistrust the people, and therefore deprive them of arms." - Aristotle,