The WathNot Shop's Gnome Firearms

From the introduction: The WhatNot Shop’s Gnome Firearms is an arsenal of blackpowder weapons engineered by the most innovative, battle-hardened tinkers of the land. Each is an epic gadget whose design follows the principles detailed in Epic Gnomish Inventing. You can count on these elegant deadlies when you need them the most. This guide also includes two new features that can be used to build other epic gadget.