Forum:Get a 5 kill streak on a mounted gun.

Gat Trigger 	File:GatTrigger.jpg 	Challenge: "MG Master" - Get a 5 kill streak on a mounted gun. Yes 	General Gameplay

Does anyone know how to do this because I had two seven kill streaks with the mounted gun on Skidrow playing Demolition and I didn't get the Callsign.