What is the smallest, useful handgun for discreet CCW?

[Eurodriver]

All have been taken into consideration.

Is the 342 worth the extra cost over the 642?

You will probably say this is not effective, but I wouldn't want to be shot with it.

It fits all your other criteria.

http://www.northamericanarms.com/fir...lr/llr-hg.html

I agree that it is definitely small and concealable in ever sense but I want something that will stop a determined threat on my life (as opposed to just a mugger looking to score an easy few bucks)

.22LR doesn't cut it.