This modlet for 7 Days to Die should give you the chance to craft 3 Elemental guns, each of which can be created with or without a workbench. These three weapons are: the Flaming AK-47, the Electric Sniper Rifle, and the Flame-Zap Pistol. These produce either a gush of flame or electricity - or both -

There's a lot of feedback about the crafting process - many had remarked that the quests are rather all too easy. The mod creator thus decided to release a new version - the "Tough Craft" version:

The recipes in this new one are lengthier; they require more ingredients which are never senseless, always deliberate: they are apt for the type of weapon and function being created anyway. To locate the required ingredients in this tougher version, we recommend that you consult the treasure maps - a lot.