Batman Arkham Knight: Guide to Catching the Arms Dealer, Cold World [PS4 - Xbox One - PC]
Let's see how to complete one of the game's side quests.How to catch the arms dealer
"Arms smuggling" is one of Batman Arkham Knight's "wanted" side missions. To complete this mission you must find all 5 weapons depots.
The video you can see above shows where all the weapons depots are located: the first one you will find during a mission of the main story, while for the others you will be informed from time to time of their presence as you progress through the game.
After destroying all 5 weapons depots you can lock the trafficker in the police station, so you will also unlock the "Cold World" Trophy / Objective.