No, not that i know of... i have herd of a cheep soution, tape the analog stick of a second controler, and snipe the person... otherwise i belive it was leval 5 that you start out with the snipe and br...
oh ya btw if you get halo 3dst it has firefight, you fight untill you loose all your life in battlefelds from the campaign... (co-op, 2 player split or xbl 4 ppl, or play 1 person)