tau cannon thin front pipes could use thickening or just be removed altogether, and the barrel connecting the gun body to the muzzle could be shortened just a tad. maybe drop the detailing in the hexagon ends of the main gun body.
also despite that extra tube on the outside connecting the muzzle to the body being part of the "original" design, it seems weird and out of place. if you thicken the thin front pipes, you could drop that altogether and come out with something that looks a little less odd.