Trust on this one - instead of messing around w/ an allen wrench, install this handy little piece and save everyone the hassle at the chrono line. It's a simple installation, it comes with instructions even!
Now you can adjust your velocity with a thumb knob at the rear of your gun (just like the title says, go figure!). Just a simple twist and your velocity changes!
||Tippmann 98 Custom, Tippmann 98 Platinum Series