Here is a tip I learned from Jack Wood himself (
PBNation Thread) that I thought you would be interested in. I'm not sure if this also applies to the previous Etek versions.
Summary - After turning off the OOPS, do not shoot out the remaining pressure.
Quote:
When you de-gas the gun, by removing the tank, the HPR and the valve chamber will empty. The only part that holds any charge is the LPR and solenoid and rammer. This is the air you can hear escape after a few minutes. It is a tiny amount of low pressure air.
If you FIRE this air out, then what you do is half cycle the solenoid so that once the LPR is empty the solenoid is stuck in its OPEN position. The gun now has no air in it, but the solenoid is open. Now, when you put the air back on again, the solenoid is open, so the air coming into the gun drives the rammer forward up until the solenoid resets itself (the solenoid needs air pressure to reset!). So that is what happens. The rammer goes forward until the solenoid has enough air in it, then it closes the solenoid and the rammer returns.
If you want to empty the gun of air from the LPR when you de-gas, but don't want the bolt to cycle on gas-up, then just hold the bolt pin back as you turn on the gas.