When i look at this this launcher and see the barrel end, I think, maybe it shoot's MIRV's? so here's my idea

hold's 7 rocket's (yes this is overused) but when a rocket hit's a surface, it explodes! releasing
a cluster grenades that do 25 damage each and each rocket deals around 60-30 damage. I think it would be an interesting weapon being able to clear out a large area of enemies