air pressure at impact gun

[aruba]

Hi all,

I am a bit confused when I hear "the air pressure at the gun should be 100 psi". I have a gauge hooked up to the impact gun, and it reads 100 when the trigger is not pressed. However, when I depressed the trigger, the gauge drops to 80 psi. So, which one is it?

Thanks!

 

[jeep450]

Most guns are rated at 90 psi while the gun is working. Depending on line size and length it may take 120 psi or more in the tank to achieve it.