Painted this gun concept a couple weeks ago for this character I've been working on and this weekend I sculpted it. Chipping away at the character still. Will update with the character once the highpoly is more done. Here is the gun for now.
As you can see I used this tracer gun as a base and just modified it and painted new stuff.
[EDIT] Little update based on feedback from a good friend/weapons artist about the bore diameter if this is meant to shoot actual bullets. My thought was it would shoot electrified bullets so tried to come up with a solution for that with the design.
