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I have posted lots of pictures, but I'm sorry, I don't have enough time to make real instructions. Don't worry, though, it shouldn't be too hard to figure out.
This design features 3 crossbow barrels(Main weapon) and a rocket launcher/ splodies launcher barrel.
Sorry the video doesn't have any sound, my digital camera doesn't record sound. It doesn't matter though because the whole point was just to quickly show you the power of this thing. It also only shot through 4 and a half cans that time but we didn't have enough cans to re-do it so whatever. Oh yeah, the gun in the video is the same one as this one, only with the rocket launcher removed.
Step 1: Stock
Step 2: Top Barrels
Step 3: Middle Barrel
However you should probably make all of the reinforcements you see in the second picture. (Sorry notes aren't working)