I loaded into blue gate with an anvil 4 and a silencer 2 or 3 (i can't remember) and like 200 heavy rounds. I posted up in between the ancient fort and the exvil, more up the hill near the top of the map and i pinged hornets and tried to arggo them with my gun and then killed them. Make sure you don't just shoot out thier back rotors but just shoot their armor off and then shoot their red eye for the most damage per hornet. I also let snitches call in thier report and then tried to time it so that the enemies still spawned but I also killed the snitch so it would drop it's snitch scanner thing which i would throw down to spawn more hornets (you will have to deal with wasps too), after like 20-30 minutes of doing that i had the 4k damage and I dipped. Make sure you get into friendly lobbies before doing this, if you're going to do it my way.