Find the Groza

"Go and get a rare gear for Nimble. First task is to bring him OTs-14 Groza assault rifle adapted to 5.45 with extended magazine. It belongs to some captain or major at the stationed at the agroprom."

- Detailed task information

 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 Groza
 * Bring it to Nimble

Find the Groza

 * The area where the item can be found is highlighted on your PDA's map, in this case it is the main building of Research Institute: South in Agroprom.
 * The item is located on a drawer on the top floor.

Bring it to Nimble

 * This should be self-explanatory.