Find the revolver

"Go and get a rare gear for Nimble. Next task is to bring him the revolver of bandit's leader Hog in the Dark Valley."

- Task description

 is a side mission given by Nimble. Though it is just called "Special order" in the PDA.

Overview
The mission consist of two sub-tasks
 * Find the revolver
 * Bring it to Nimble

Find the revolver

 * The area where the item can be found is highlighted on your PDA's map, in this case it is the Bandit Base in Dark Valley.
 * The item is in the same safe as Borov's Documents, objective of Find the bandits' documents.

Bring it to Nimble

 * This should be self-explanatory.