If you want to build something bigger check out my shotgun
Step 1: The Barrel and the Trigger
It is just a couple reds and a trigger.
Step 2: The Handle
Step 3: The Firing Pin
Step 4: Connecting the Pieces
2.) Attach the handle to the barrel.
Step 5: Adding the Rubber Bands
Step 6: Finished!!
You have just built one of the smallest knex pistols ever built