This gun sprays like a dream. It does bleed a tiny bit of air from the aircap when the trigger is released.
You have to hold it right up to your ear to even hear it. I'm not sure if its supposed to do that or not. Set your air pressure at around 23 psi and adjust your fluid and fan to your liking and it sprays amazingly. My friend that rebuilt it said it whispers!
The gun is mounted to an 8oz pressure assisted cup. You can use this gun in either a siphon or a pressure configuration with a 2 quart pressure pot. Very rare in this condition and with a metal body.