You could i guess, but i don't know if it would work, why not try it
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Smart Parts Owner #220 Paintballman19
89X Listener
No need for 2 QEV's. The purpose of the first QEV is to shorten the length of the air venting to allow the bolt to come forward durring the firing process.
that is the only time air vents... Not like an autococker ram, it needs to vent in both directions. (hence the need for 2 QEV's)
So yes, You can install another QEV, but it will do nothing for performance.