Let Me Show You How it's Done, Boy.

This is how you get the outline for a side arm. But don't print one out and them trace it. Tracing should only be used for practicing getting the feel of an object or shape or more likely for symmetry, hence use tracing paper. But anyways you can call this the skeleton of a hand-holding-gun.
I also drew the bullet being projected out of the barrel. Pretty awesome, ja?