[suspicion]That looks ALOT like my Minimi, with a few pixels moved around.[/suspicion]
It's the same gun? But no, the shading and outline are completely different. For example, take a look at the barrel length. Yours is much longer than his is [and that is not what she said].
The minigun graphic is still stock; while it's only a minor technicality, the difference in style feels like a wrong note -- the knife and chainsaw have shading a bit closer to yours, so you can get away with those. Keep it up.