(sorry about the long link)
The Gun:
Chamber: 2" and 25cm Long
Barrel: 1/2" and 80cm/ 1/2" and 30cm long (for the silencer

Valve: Modified 25mm solenoid sprinkler
Valve Actuation: 1/4" GMC Blowgun
Fill point: Metal shrader (freebee

Stock: 3/4" (air does not go into stock)
The Silencer:
Length: 20cm
Width: 2"
Holes drilled into the barrel: 30
Insulation: Fine steel wool
All fittings are PN18 and all of the pipe is PN12 (except for barrel, PN18)
Ill let the pics speak for themselves....
The whole gun (with silencer on the ground)

Modified Sprinkler Valve with GMC blow gun, and fill point

My Stock, with shell holding system


My Silencer (used fine steel wool to insulate)

Comparison against a Lynx deodorant can

Looking down barrel

Looking up barrel

***UPDATE***
I got my barrel today and i sealed up the leak i had. I took some more pictures, and have fired this baby and OMG it has some awsome power, will get vid when my parents arnt home (dont think they realised how powerfull it would be)
Front end of silencer

Looking down barrel with silencer

With silencer attached


Normal barrel

DAMAGE:
I was shooting a buckshot of BB's at a card board box at like 45PSI and went all the way threw, and made massive dents in my wall (rents are going to kill me

Entry+exit (might not be able to see the exit)

Wall:

Well heres a video of me shooting it inside (with BB's) and outside with silener and with a marble.
***ANOTHER UPDATE***
Heres another update with more pics, new handle on the barrel, and a thing that stops my barrel from blowing of when tight fit ammo is in the barrel. Heres he pics...





I have got heaps of vids of my gun shooting at wood from 20m + and going threw, but hey are too big to puton you-tube, i can reduce the size slightly but not enough to make a good vid
so i might just put up single vids, and put them all on here.
Yet to come:
Red + Green Dot Scope
15mm Copper barrel (1.2m for $15 aint bad


Tell me what you think, and comments and suggestions are welcome.
Thanks, Thursto