Help me to Build the Cathedral of Mandalores!! 
But the thread was : Armed to the Teeth.
I remember that in Half-Life you have a rifle with a grenade launcher, and it was also used in some episodes of Stargate. I think that this weapon really exists. it's a small-sized weapon, and could evenetually be placed on... a gauntlet, maybye... or in a jet pack... BOOOOOM! *lol*