Look at your marker (The barrel pointing left)
There should be and angled hole with an Allen key slot, roughly in the middle of the marker.
Turn it clockwise to decrease
Counterclockwise to increase
Unscrewing the Allen key screw OPENS up airway INCREASING VELOCITY
Closing it = CLOSING AIR DOWN = Decreases vilocity
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to turn the velocity up on a tippmann a5 you could do several things but the correct and recommended way to do it is to locate the Allen head screw on the right side of the receiver just above the piston housing for the cyclone feed. finding the right Allen key, turning the screw clockwise (tighten) will decrease your velocity. turning the Allen key counter-clockwise (loosen) will increase the velocity. also purchasing an aftermarket rear spring and having it installed will increase velocity. switching to HPA (compressed air or nitro) will also increase your velocity slightly and is a lot better for the internals of your marker.
you see the little un-jammer button you pull out when your is jammed pull that out and then fire.
With the screw the hooks in from the outside. just play around with it until you can get it to reset easily