Well i found very critical bug that allow players to dupe weapon attachments and it's needed to be fixed.
To replicate this dupe you will need to:

1. Use a any gun crafting station
2. Have two or more gun parts of same type and material
3. Open the gun crafting station
4. Press the arrow button for the gun part you want to dupe several times
   and Voalá you've duped the gun parts