Between the weathered liberator and the TIDAL wave harpoon, the harpoon will be your best bet. But once you upgrade to the i110 liberator that will be your bis until your t9 weapon. The WD grossly outweighs any loss in det. I currently have the upgraded liberator, 495 acc and am sitting at 366 det, so I don't know what y'all are complaining about.

*i also have a bunch of crafted and melded gear