PSR .50cal (Pneumatic Sniper Rifle)
Barrel - .5" sleeved in 1"
Bipod - .75" with medium sized hose clamp.
2x 90 elbows
1x 45 elbow
Valve - 1" mod sprinkler valve
Pilot - Blowgun (for ergonomics)
Chamber - 1.5"
3x 90 elbows
1x T
EDIT: I spray painted it black, added some pvc caps to the bipod, replaced the dwv wye with a tee and I have some damage pics also.
This thing has beastly power. I can really feel any recoil because the majority of the time I lay down when I shoot it. But wowee, this thing flings a marble pretty far for just being at 50psi.
Whole Gun

Ammo (14mm marbles)

Entrance fired from ~25yrds away.

Exit

I hope you guys like it. This is probably the longest ive spent on a single cannon, I put alot of work into this one.