"Other" - No exploding targets", due to constant fire risk in the desert. That's about it. We have full auto there, and brass on the ground is how I get half my supply.
The UNSPOKEN rules is Thous Shalt Not Brass Rat Whilst The Shooter Is Still Shooting...
The only other rules are the regular Four Rules, and we enforce it amongst ourselves. If someone shows up who is unsafe, the rest of us try to correct it, and if we fail, we leave.