Well, I can do conventional firearms that have explosive rounds. Or melee weapons that give off micro drones that explode. But something really based on explosions and fighting, would be an actual grenade launcher or rocket launcher. A grenade launcher would be good for mobility, but while rockets will make you slower with both ammunition and the gun weighing you down, I could still work with it. But my recommendation for now is a grenade launcher. Which I can make and modify to your liking.