"I am actually in the process of writing a book covering some of this, but here are a few things to think about...use threat analysis to figure out what to do.... a handgun is most likely going to be used in a crime, such as a mugging. now you can defeat a gun mechanically (revolver-block firing pin, auto-stop slide, drop magazine, etc), but these are nearly impossible to do for real, and it also re" . . . .