Instructables
This is my first Instructable and it is a knex tank it is pretty powerful, I mean it.

 
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Step 2: The ram

Picture of The ram
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build the ram. you need the tape on it or it will fall off when you fire it.

Step 3: The barrel

Picture of The barrel
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build the barrel it fires best with the blue rods.

Step 4: The shell

Picture of The shell
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build the shell to hold the barrel.

Step 6: Put it all together

Picture of Put it all together
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put it all together. I have a lot of pictures to help.

Step 7: Add the rubber bands.

Picture of Add the rubber bands.
add the rubber bands as shown. now pull back the ram load in a blue rod and fire it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
if that is the trigger, add an elastic band, and a yellow connetor with white rods coming from it from one end, and the diagnoal slot, like \ /, then connect it to one of the black pieces, and attach the elastic band from the horizontal white rod, to the trigger
its not a trigger
oh, then what exactly is it?
a block trigger
ok well i was half right