Well this is my 1/2 inch piston valve rifle.
The barrel 16mm(roughly)x65cm long steel. Fits marbles nicely. Preferred ammo is homemade plastic nail darts.
Blowgun pilot
soldered in schrader valve
Air chamber is 40mm pvc, goes up to 160 psi ive bombsheltered and tested it multiple times
i have a slighly smaller airchamber that is 40mm copper sleeved in pvc estimated maybe 300psi with it , all i have is a 160 psi bike pump so ive never gone higher than that.
Piston
i took a "do not eat" cylindrical silicon capsule that was the diameter as my piston housing and poured epoxy in it and added a bolt through the middle to hold on a few pieces of inner tube bike rubber for the sealing face.
The inspiration was this
http://www.spudfiles.com/forums/50-qev- ... 21420.html
I dont have many pictures of Mk1 but i have a video
[youtube][/youtube]
The Upgrade for mk 2 were
carved Wood stock and foregrip ,
piston housing shortened (there isnt a spacer piece before the tee as seen in the mk 1 video),
170 Psi gauge on air chamber
Scope and scope rail
This is mk2 closeup

Rifle itself


Scoped out

i was going for apocalyptic , howed i do? haha
ill throw in requested pics , just request!