The Scotch Guardian

With four times more barrels, you can shove four times more deadly explosives up your enemies' respective bottoms!

This is my first real model ever. It is a grenade launcher designed with the special ability to shoot all four barrels at once in mind. The launcher has 3 LODs, the grenades have 2.

I know Valve comes up with their own attributes for weapons, but here's how I'd imagine it:

Hold Primary to build up charge
Releasing Primary fires one extra grenade for each second of charge (up to 3)
Charging decreases accuracy
-30% walk speed when charging
-25% damage done

It would be extremely efficient for crowd control, but firing all 4 grenades at once would require a bit of timing, and the spread would prevent you from getting instant kills too easily.