1. Do not rob.
2. Do not rob a gun shop.
3. Seriously, do not rob a gun shop. It may seem tempting, with all those guns in there, but you know full well the clerk is armed and knows how to use every gun in the building.
4. Odds are the other customers are armed too.
5. The guns in the gun shop are not loaded, because of anyone that might try to rob the gun shop with its own guns.
6. If you try to rob a gun shop with a gun, you will be lucky to live to see trial.
7. That all established, the way to avoid that fate is to not rob the gun shop with a gun.
8. That does not mean you should rob a gun shop with a baseball bat. The clerk will still pull his gun on you.
9. Oh, and the knife that you have on hand? Do be mindful of the saying about bringing a knife to a gun fight.