Screenshots of what you're doing.

It's on a spindle, the third barrel is in firing position. It's hard to see because of the coloration, I didn't see it at first either. It's easiest to see by looking at the triangular orientation at the back of the barrels in the third image, or in the second image, the furniture on the front of the barrels. Otherwise the two barrels on top would make no sense.

And the solid blue/green blocks on the front corners look like they're made to hit stuff with. It would need a little simplification/beefing up but I think it takes some looking at to get past the weapon looking 'framey' and fragile, it's actually fairly solid and has a lot of material to it. The rod on the bottom would probably have to be taken back so the front only consists of striking surfaces. I dunno, that's just the way I see it.