Specs from barrel to chamber: 2 1/2 feet of 1/2 sch 40, 3/4x1/4 reducer, 3/4 watermaster sprinkler valve, 1/4 nipple, 1/4 blowgun, 3/4 male fitting, 1x3/4 reducer, 1 1/2x1 reducer, 1 foot of 1 1/2 sch 40, 1 1/2 endcap, schrader valve and psi gauge.
whole cannon

cannon taken apart

cannon's chamber and valve assembally

damage pic #1

damage pic #2(notice how the threading of the bottle is in the cap)

ammo

hope you guys like it