how to make an airgun with airstopper?

[spud-freak]

hello guys
i'm looking on youtube for homemade airguns, i found a video
with an airstopper at the end.
then i have build a qev airgun and i wont to make the same, but when i mount the airstopper, the gun doesn't work because the piston won't open
why?
thanks for help

the video:


and my airgun:

[Crna Legija]

idk what you mean by airstopper but your lucky because wyz2285 is a member here at spudfiles.

[lemming124]

by airstopper do you mean blow gun/ hose gun/ pilot valve?
maybe the qev is the wrong way around?

[ilovefire]

do you mean the part that he uses to achieve semi auto? if so youll have to post picks or a diagram of the one you made before anyone can tell whats wrong

[jackssmirkingrevenge]

A picture of your piston would be helpful, is it a tight fit in the tee?

Probably what is happening is that more air can flow past the piston than can flow out of your "airstopper"

[spud-freak]

i mean the part, that make the gun semi auto! at the end of the grip
you can see it on 1.55
how do i made this?
when i load my gun, it doesn't work because the piston of the qev won't open, it has not enough air to blowback the piston..
i mean when i have mount this "part that makes it semi auto.."airstopper"
do ya understand?

[Crna Legija]

read through this thread

[spud-freak]

oh thank you very much!