Can you say what state you live in?
do they not have a concealed carry law?
If not, what's the penalty for carrying concealed?
If felony (some states), think hard about it.
If misdemeanor, I'd be a little less worried.
On the gun, do you really want to put it in your front pocket? If so, you need something pretty small. These work very well and aren't terribly expensive:
http://www.kel-tec.com/p3at.html
You don't need to worry about an external safety - just get a pocket holster.
If you're seriously thinking about confronting a gang, know what you're doing at all times; get very good with the gun on a combat range or just shooting cans in rapid succession outdoors - hitting them repeatedly as they stop moving; Think about what you'll do ahead of time when attacked/confronted; and get a more-powerful gun. The Kahr PM series that Co Hummer mentioned on the other thread is very good (though I would go with the .40 S&W personally). You might want to get the Glock 27 also. It only a little bigger, has a longer barrel (there's a pretty decent energy increase going from a 3.0 to a 3.5" barrel), and holds 10 rounds (9 + 1). IMO though, the Kahr and Glock work better from a holster than the pocket, but they have jmore knockdown power.