50 Cent a gangsta? No.

(and by "gangsta", I guess you could say modern day gangster)

examples of gangsta rappers:

We'll start off with this one.

Straight Outta Hunters Point

Killas By the Dozen (and those are nortenos, not bloods, don't get it twisted, there's a HUGE difference)

Politican


And if you're really gonna say 50's not gangsta and are going to say so and so is, please, don't list mainstream rappers. Chances are, when a rapper goes mainstream, they lose the gangsta aspect of their lives over time. Not all cases, but I'd say a good majority. Mainstream entails lots of money, and usually they're living in a mansion out of their ghetto and leading a celebrity life.