In the Fx Dreamline manual, in the regulator section it says: Never use the gun below the set regulator pressure, as damage to the system can occur and will void the warranty. This means that if the regulator is set to 140 bar from the factory, when the tank pressure gauge reaches 140 bar, if we keep shooting and the regulator pressure starts to drop, can it be damaged? When I have done chronography I have shot below 140 bar to see how the speed of the pellet behaves and I have seen other people do it in their chronographs.