I did this on a EAC Server named: The Hangout 2 (Swedish public server)
You need Repair kit and a 2 weapons that is only damaged 1.
Example: Repair the Pistol and it wont take a Repair kit then you dont take it out of the box when the weapon is repaired. Then repair for example the shotgun and you will have 2 pistols. Its hard to tell how it works but for me it works. Tell me if it doesnt work for you and I will help you!
I did this on a EAC Server named: The Hangout 2 (Swedish public server)