Why do you have to screw in the velocity screw all the way before you take apart an A5?

Having it either removed or screwed all the way in makes taking the marker apart (seperating the receiver halves) easier. At the in between locations the velocity screw tends to bind the receiver halves.

Edited Note: I prefer all the way in because with my luck I'd misplace it if I removed it.

Mantyluoto wrote: could doing so cause a reduction in velocity? we have 2 A5's that we cant get over 225 FPS, both have flatlines and response triggers.

Could WHAT cause a reduction in velocity? Screwing the velocity adjustment screw all the way in allows it to clear out of the adjustment hole in the receiver (shell). Just a few turns to reduce its protrusion from the power tube. You don't grab the ALLEN wrench with a pair of vise grips to torque it through the side of the marker...or strip the threads in the plastic power tube. Adjust it inward with clockwise turns until you can see that it is close to being below the marker shell. If you turn it in far enough so that it stops, quit turning it!

Yes, you do have to re-chrono it to adjust the velocity after re-assembly.

Mantyluoto wrote: sorry wan't clear enough, if i don't wind the VAS screw all the way out could that be the cause of low FPS?

The velocity screw is an adjustment. You turn it inward (clockwise) to reduce velocity and outward (counter-clockwise) to increase velocity. If you turn the screw out far enough so that it no longer protrudes into the gas channel inside the power tube, going any farther is of no value...and you might lose the screw when it falls out on the ground .

If you have backed the screw out as far as it will go, without disengaging it from the threads in the tube, and you cannot get the velocity high enough, then you have to pursue other methods. Easiest solution might be to switch to a larger paintball. A paintball that fits the bore more closely will travel at a higher velocity with the same amount of gas than will a smaller ball.

The next solution is to replace the power spring, the spring that drives the hammer into the power valve pin, with a stronger one from one of the after market kits available. This is the most common way to raise velocity.

where do i find an after market kit in the UK?

thanks for your help in this.