Board Thread:Off Topic/@comment-25396609-20170505174118/@comment-27144409-20170603000333

The tube on top would be behind the katar, over the user's arm, since that's the helical magasine. The rest would be stuffed inside a thick katar blade The pistol grip would be gone, replaced with a horisontal grip, more like that of a normal katar.

It's going to be a fairly bare-bones system, and I can tweak it or find alternative firearms.