Well, if people are starting to bring guns and attract that kind of crowd, I would say this spot is finished. I would hate to see someone injured over telling one of these fucks to leave, because I doubt they will just say "Yes sir" and go.
Or, maybe skip a weekend or something to eliminate some of these fucks. If no one else shows up, they will think the spot might be dead.
For those saying get the police involved in controlling the lot, how do you plan on doing this? The police certainly won't stay there and control things. They get OT to do stupid things like that, and it is probably the farthest thing on their list of to-do's while on duty.
My 0.2.