i'd go old school for something like that. i mean, it's definitely a traditional tattoo and whichever artist you decide on will most likely throw his own flavor on it, but for something like that i would stay away from things that would 'date' the tattoo - like those flames.
kind of like this:
as for the weapon and the projectile, i would rely on true pictures of them - otherwise it comes out looking cartoonish and that is miles away from what you are trying to project (i think).
good luck with it. and try to stay away from sensitive areas of the body where constant, sustained needle contact would be the result (all of that black will send you up the wall). just my opinion, you understand.