When I took my CHCL class, the instructor discussed this. The most amusing thing he mentioned was to watch for "The Felony Look," when a criminal looks around right before committing a felony.
A gunfight is not the time to learn new skills.
If you ever have a real need for more than a couple of magazines, your problem is not a shortage of magazines. It's a shortage of people on your side of the argument. -- Art Eatman