did you know, that in the xbox version, if you switch weapons just at the right time while walking through the checkpoint, you can make rocket launchers that fire like the ARs?
Basically, if you switch at the right time, the firing mode of one will get mixed with the model and melee of another. The trick was to make a plasma pistol that could shoot shotgun shells. That way you get the strengh of the shotgun with the superior melee speed of the plasma pistol