I'd check their site on this. Here's my take... Completely unloaded.
1. No clip/magazine (I'm not going there) in the firearm
2. No ammo in the class, period. Don't even carry it in a seperate container or in your pockets. If I remember correctly, if you shoot there, you have to buy it there.
3. Personally, I'd lock the fiream open before entering the class