I would have a thorough talk with a local lawyer just to clarify any issues with the liability. And I don't know how it works there, but here, if your horse kicks someone on public property, you are held liable and since you are a part of a group, then the person could hold the group liable too for including a "kicker" horse. As for the laws with carrying firearms, I would visit with your sheriff or chief of police. I believe that in order to carry firearms to enforce laws or do security, you have to qualify and carry some kind of license plus more liability insurance in the case that anyone actually gets shot. Good luck and welcome to the forum.