| To rig up a rear velocity adjuster (aka RVA), you basically just need to drill a hole into the rear upper plug, then tap some threads. Usually 1/4", or whatever you have handy.
On the other side of the plug, stick a washer between the plug, and spring guide. Then screw in a 1/4" screw until it pushes against that washer. Turning any farther will raise FPS, then backing out with lower. (I think dimes are the right size? I know nickels are the right size in the lower tube)
Much easy to set your FPS while at the chrono then the factory method.
nick
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