Did you even read that article or just the first few paragraphs? The data is all over the place and has nothing to do with any FBI study like you initially stated.
Please tell us why someone needs an assault rifle that is more powerful than an M-16 with a hundred round clip, modified to fully automatic that was designed for one purpose which is, killing people on a battlefield.
And don't give us the bullshit about hunting with them. They do so much damage that any meat you'd be able to salvage wouldn't even be worth the kill.