I think my piston doesnt work because its not cut straigt.
When I start puting pressure in the gun it just leaks out of the barel. So the piston doesn't hold the air. I'v tryed a longer spring and it didn't worked. But then it also leaked at my connection to the blowgun. the only way how i can seal it is by putting extra layers of rubber in it because i cant gleu it all. The connection is made out of a bolt (don't know where its for, found it in my garage) with a hole in the center I'v made. I will buy my own blowgun soon but i don't know when. But i'm sure my next gun will be coper

to demon. thanx dude. i think i get it now(i hope) i like your bolt design