For the Double barrel you will need:
Two 3" cpvc lengths 1/2" and one 3/4" section(approximate for both)
Two 1.5" lengths of 3/8" vinyl tubing
Electrical Tape
Glue
1. Cut both vinyl tubing like so, so the tubing will fit.

2. Fit both pieces into the 3/4" length of 1/2" cpvc and glue it down good.
3. Wrap E-tape around the the end of the vinyl tubing so it fits snugly.
4. Slip the 2 sections of cpvc over the vinyl tubing.
5. Glue it down good. Connect the 2 with glue also.


END OF PART I
For Part II you will need:
10" of 3/8" vinyl tubing
Drill
Electrical Tape
Glue
1" stub of 1/2" cpvc
3" section 1/2" cpvc
1. Cut a 1/2" hole in the shell just forward of the trigger.

2. Wrap E-tape around the end of the vinyl tubing so it fits snugly on the cpvc.
3. Slip the cpvc over the vinyl tubing on one end and glue it in.


4. Cut laser like so, opening it up helps.


5. Slide Vinyl tubing through hole and glue the other end in.
6. Position the barrel so you can connect the other end to the coupler, glue it place.

And your done!
