How to make a RPG (Rocket Propelled Grenade) I don't know if this is of-topic or anything, but: I have a big scene with cops and stormtroopers fighting. And the cops need some stronger weapons than some sub-machine guns. So i was wondering if there were some people out there who had done anything similar. Does anyone have some RPG or anti-aircraft gun/big turret gun ideas?
Some of the Indiana Jones sets had some simple heavy weapon builds in them.  

Set# 7625 had a belt fed/ammo-box mount style machine gun:  

  

Set# 7626 had a RPG: