With some more detail, and better texture it could be really cool. I'm not great with abstract-future-prediction-technology. It could turn out that that's exactly what a gun, laser/gun, atom-shasher gun, high audio frequency gun could look like. So it's hard to tell what the ammo is, or should be. Or what features such a device may need.
The only thing I can say for sure, is that the texture kind of looks like black foam, wrapped in duct tape. Which is probably not your aim. I like the dark gritty texture, perhaps if it were mapped better, It would give it a different feel.
Just keep working at it. I'm sure it will impress with a little toch-up!!!!