Hmm, pretty good
The artwork is pretty nice, and the animation is pretty smooth, but the 24 frame one jerks a little when it eh... is facing my left. I think. Whatever, it's still a little jerky. As I said, the art is pretty nice, but this wouldn't be too helpful for a "real" animation. If your going to use these to animate, I would suggest animation say:
Minigun
MinigunFiring
MinigunStopping
MinigunRecoil
MinigunBullet
After which, you can combine them (those were suggestions. I don't draw guns in detail, or I haven't yet, so those were off the top of my head) to create things in your animation if necessary. Also, in future, I'd suggest not submitting tests? Thanks, and once again, decent work.