I know it's not done, but I still don't like where it's going. It just seems boring and doesn't compare at all to the front. You've got the details like the dial and buttons, and they're fine, but the base shape is uninteresting. It doesn't make me think "wow" like the front of the gun does. I would try to imagine what other components a gun like this would need, like capacitors and electronics, and somehow integrating them into the mid-section of the gun. A scope of some kind integrated with a flip-out display would be cool. Also, that canister looks like it should have more to do with the reloading than that shape on the side of the gun, although I don't know what you have planned.
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