Board Thread:Off Topic/@comment-26397825-20160715033136/@comment-25396609-20160914195014

The weapons used by huntsman are all custom built. you're not going to be find general purpose upgrades, they would have to be built specifically for the weapon in question.

That means you have to make the thing yourself if you're going to use it with your custom weapon, at which point you may as well just integrate it into the body of the weapon to begin with.