MAG: Combat Fragger Ribbon

I cannot seem to aquire this ribbon. I try and try, but I can't reach 10 kills with frags. I think the most I've hit was 8, and that's with hitting 4 at one time! Are there any tips / reccommendations that any seasoned MAG players can let me in on? I am in prestige mode (or w/e it's called), currently on Valor, with the improved grenades skill. Thanks to all the contributors:).

maybe the m203 would be easier to do it with

The best is if youre on defense on a domination map. When your team gets back to their control points just squat by a supply pile and lob grenades at the guys trying to get your gates down. Its not really that hard if all you focus on is throwing grenades and resupplying yourself.