Ya'll have fun with this one, it is pretty darn cool. After you get finished building it pull the rubber band back and put it in the two slots of the yellow pieces that is atached to the trigger system.

Step 1: First Part of the Catapult

Self explanatory

Step 2: Main Base

This is the trigger system.

Step 3: Trigger System Cont. (Parts)

Step 4: Trigger System Cont. (rubber Bands)

Attach the rubber bands to the white rod on the bottom of the trigger. After complete, then attach the two yellow pieces to the bottom grey rod on the first piece.

Step 5: Bottom Frame

The pieces may be off centered a little bit.

Step 6: Bullet's

self explanatory

Step 7: Rubber Band for First Piece

Insert the rubber band on both sides through the orange pieces and attach the ends to the top grey rod. In the middle of the rubber band, you need to wrap it with tape.