I have been trying to make ou mod a QEV semi-auto for a long time, but I got no where

.Recently I got a idea to make a semi-auto blowgun to pilot a qev to get a semi-auto qev sistem,and here it is

.The chamber is 30cm 1'dia metal tubo,charged to 160 psi, and I can shot a amazine 40 times!

(not very powerful,but still can make a holl on a can

)and i can ajust the power,shoting speed,times i wants to shot
