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The QEV increases the air efficiency, giving you more shots out of a tank because you can lower the dwell to 10-12. It also decreases the bolt action time, making it possible to shoot a higher bps, if you have a uncapped board. It is a very good upgrade considering its only $15. I think the best aftermarket bolt would be the Lucky 1,2,3 kit. Its just as good as a Orange bolt, costs less, and is more reliable.
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