Most idea's 'borrowed' from KillerK's gun LOL.
Step 1: THE PARTS (only for the barrel part because it's the most complicated for the entire project.)
Step 2: Build the 'Barrel' of the gun.
Be sure to look at the other angles of the barrel so you get it right!
Step 3: Front Of Barrel Construction.
Step 4: Rear of Barrel Construction.
And then add the two small black connectors on the underneath of the gun shown in picture two of this step.
Step 5: Ram/Sniper Rod
So I just used a gray rod, but you could use the black rod if you want to, it would most likely increse the performance even though this gun already shoots a good 200 feet.
I also have hotglued the end of the pieces and then wrapped them in tape **WHILE THE GLUE IS STILL WET** to make the gun able to with stand a ton of rubber bands.
I ALSO SHARPEND THE TIP OF THE ROD
IDEA CREDIT TO KILLERK
Step 6: Trigger Device Elastic Assembly
Step 7: Front Handles and Elastic tracks ( Three Connection Red Pieces.)
and then take another two and put them on the top of the barrel onto the last set of the short black connectors.
Those will help guide the elastics to keep it all clean. :)