My brother owns 3 conv.stores and i keep in mind that if someone were to come in and try to rob me , its the same as saying he will kill me when he is done.If he is armed its a threat to my life and working in a c-store you have to keep that in mind and be prepared for it. A gun in the safe and even a darringer in the till (cash drawer). Keep a piece of pipe near by and do what you have to do asap.Watch as each person walks thru the door if he looks even remotely suspicious ...get ready for possible action