When you will see/meet Moog, he will assist you on Helping Gizmo, and when you complete it, he will give you side quest of killing some creatures as side quest.
The quest location is in Suburbia and the quest name is Defeat the Schacky TrunkGnut.
Once you reach area the boss will look like this:
After defeating boss he will drop this key and side quest:
Track the quest and the area should be close to boss that you killed, which will lead to the cave which looks like this:
After entering Cave there will be metal door that you can enter and from there on just follow threw the cave all way inside.
At end of it, you will see final door with some loot and the weapon it self and use key on keypad near the door. (I alredy looted it sorry :P)
How Weapon Looks
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