>>64141061
I think you're on the right track, but the problem with rifle/grenade launcher combos is the insistence on the rifle part.

A good grenade launcher is a much more effective weapon than a rifle at 100-300m range, so the only reason to really have the rifle is so that the grenadier doesn't get caught with his pants down in an ambush or CQB, so what the grenadier actually needs is more like a PDW

Therefore I propose some small and light bullet hose in 9mm or 5.7 (pic rel) as an underbarrel attachment for a big and capable grenade launcher like a Milkor MGL or an M79 with an optical sight