Some guns offer two air inlet locations: one on the bottom of the handle for non-bleeder set up and the second (bleeder setup) directly behind the air control valve to improve atomization with heavier materials.
Acrylics should be shot bleeder-style for the best of the materials.
Dont forget to insert the plug into the bottom of the handle.
I use the HVLP CapSpray 4 stage, no luck with super nice finishes using acrylics even with #4 projector set.