Step 1: The Supplies
1x Hollow Tubular Tube (Duh)
2x Bulldog Clips
1x Rubber Band
(and maybe a small piece of black tape or aero film to make it look nice)
Step 2: The Barrel
Step 3: The Firing Mechanism
Second. place rubber band over the back top part of the bulldog clip and pull to the front of the clip, twist and pull to the back of the barrel.
Third. when fixing the band with another bulldog clip try to align the band with the middle of the barrel to allow even power distribution to make it fly staight.
( if you dont understand i didnt miss out the photos of the steps even if they are easy)
Step 4: Cleaning UP
(i used a metal nail file to smooth the edges).
Step 5: End Product / Troubleshooting
1.if your band isnt powerful enough, back in step 3 you put the band on the back instead put the band on the front and twist an extra time.
2. if your ammo wont shoot straight you need to re-align your band to the middle of the PPC.
3.if your ammo still wont shoot straight you will need to make an adaptor for smaller ammo, check back later for an instructable on it.