Power tuning my Marauder .22

If you work on the valve itself you'll have to get into the air tube and definitely degass! If you are only working on the hammer tension or velocity metering screw, then no. Any work done on the pressurized part of the gun requires a degass! Hope I made sense, DO NOT start work till you're sure you understand what you are doing, high pressure air can shoot loose parts with deadly force. That being said, the Marauder is an easy gun to work on, just be organized and take your time.

Awesome avatar, BTW!