Gunfire

The past 2 or 3 weekends I have heard someone back behind us doing what I thought was probably some target practice with a small caliber rifle or pistol. The same thing happened this afternoon and I thought nothing of it until I heard several bursts of fully automatic fire. I don't really mind so long as whoever is doing the shooting is being both safe and legal, but I tend to have my doubts about the legality. In my life I have known several people with fully automatic weapons and the only one who was legal was a dealer.