Nothing new - some china QEV,galvanized pipe as chamber,16mm ID barrel and 100-120 psi operating pressure.(takes some time with my puny shock pump)
It can shot 2 or 3 times before pressure drops to somewhere about "hey-its-not-shootin-its-just-farting"

I use dart as projectile(nothing special here - just nail, paper amd some glue)
Here some shooting video and damage
[youtube][/youtube]
PS.And sorry for my bad engrish, i am half chinese\half russian
