feakshow, what he is saying, and I absolutely concur, is that historically, you are much more likley to be prosecuted for legitimate self-defense if you use a full-auto, no matter how clean the shoot was or how legal the weapon was. The process of GETTING CLEARED in the shoot might break you.
There are simply not enough cases of legally owned machine gun defenses to draw ANY kind of conclusion about that, so I don't know you you can say that really.
The HK case is always thrown out at how costly it can be, but keep in mind we're talking about inside the home in this thread. The HK deal was a VERY different set of circumstances.
The other famous use of machine guns for defense did NOT result in big money spent on lawyers, nor did it result in the gun being confiscated for a long time.
The case in question was the gun store owner (can't remember his name now) who used a legal machine gun on TWO different occasions (1 was an Uzi, can't remember the next time) to defend his own property, the gun store, against intruders.
Both of those were ruled legit self defense and no charges were filed.
It's such an extremely rare occurrence to use a firearm in defense of your home anyway, then add the rarity of machine guns at all, then add the rarity of those owners who decide to use them in their home defense situations.
Please post a case where a legally owned machine gun was used for defense in the home and the homeowner had more problems because he used a full auto.
I'll patiently wait, because you won't find any.
Hell, post ANY case where someone used a machine gun in their home for defense. Doubt you will find more than 2 or 3 stories, if any.