Personally, for most self defense situations i would prefer a good powerful semi automatic, but my question is this: In terms of the laws affecting using say a sub-machinegun to mow down a burglar in a self defense situation, is it legal? Lets say the state where the unfortunate situation had taken place was a castle doctrine state. Are there any legal ramifications to using this type of weapon vs. using say a Glock 19? Just a made up example of an unfortunate situation where the answer to this question might be desirable: Youre sitting there admiring your newly purchased, fully loaded Heckler and Koch MP5K-N PDW at your kitchen table one friday night, caressing her fine features, mighty happy with yourself, when all of a sudden two armed thugs crash through your front door and shoot your dog. You spring into action and mow them down full auto style with well aimed short bursts and call the police as soon as youre sure they are dead and gone. Would you be any more in "trouble" than if say the same situation were to happen but instead your weapon was a well aimed Springfield 1911? I tried a forum search followed directly afterwards by a google search and found nothing. I'm just curious. TIA.