Quote:
Automatics are illegal, but they wont care.
Fully legal if you're willing to pay for them, go through the extremely extensive background check, and then pay the required fees and taxes. A fully automatic weapon can cost into the tens of thousands of dollars with historical types (Thompson, BAR, Stg44, etc.) going for six figures if they're in pristine condition. Also, the gun must have been made before 1986 to be legal.
But people willing to go through all of that are highly unlikely to commit crimes with the weapons.
Very likely his gun was either purchased illegally, or he modified it illegally.
"If you will not fight for right when you can easily win without blood shed; if you will not fight when your victory is sure and not too costly; you may come to the moment when you will have to fight with all the odds against you and only a precarious chance of survival. There may even be a worse case. You may have to fight when there is no hope of victory, because it is better to perish than to live as slaves." - Sir Winston Churchill