thx al-xg... lol it is the same type as mine hmm so I have a piston QEV....
I've shoot tens of times with this near 350 psi and it still works well
BTW does anyone here knows how to increase ID of a steel/malleable pipe ? I've managed to widen first ~ 8 cm of my barrel and then the die grinder broke (I don't know whether I used a correct word, it is just a gringing stone on top of a rod that can be attached to an electric drill)
those ~8 cm that were succesfully widened have perfectly smooth surface and ID of 16 mm which is exactly what I need... is there any other tool that i could use to do this or is it a waste of time ?
if anyone has any idea how can I do this with the use of my electric drill and what tools/drills should I use I would really appreciate that