Depending on the model of gun, typically there is some sort of setscrew either in the side or back of the gun which you can adjust to alter the amount of air entering the chamber and therefor the speed. Some guns also have regulators which can be used to adjust the pressure of the air entering the gun's valve which can change the speed of the paintball. It is best to consult your owners manual to learn the procedure for your particular gun.
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On an Ion you adjust the Regulator with the proper wrench. Clockwise to increase, counter clockwise to decrease
On guns with rear adjustment (azodins) you screw the back plate in with the proper Allen key clockwise to increase and counter clockwise to decrease. This is also how you adjust the regulator.
On a Tippmann you screw the velocity screw with the proper Allen key. Clockwise to decrease, counter clockwise to increase.
There is an adjustment knob on the back end of all spyder guns. You adjust it with an Allen (hexagonal) wrench. clockwise is higher velocity, counter clockwise is lower.
if you mean ion you take a wrench at the regulator (front handle) on the bottom you can turn up or down the fps you need a chrono to see the change
Take it to a chronograph for an exact fps, or ask an experienced player for a rough estimate.
You put an allen wrench into the velocity screw on the back end of the marker. Turn it out to decrease and in to increase.
The fire rate on the alpha black is constant. The only thing would be to buy an e grip or response trigger.