As long as the gun cycles correctly and consistently when gassed up, you shouldn't worry too much about the solenoid producing an audible *click*. If you'd like to, you can disassemble the solenoid by unscrewing the 3(?) screws on top of the solenoid, allowing you to remove the solenoid piston. Take a cotton swab to the internals of the solenoid and wipe off the piston before reinserting it back into the solenoid assembly dry (do NOT oil the solenoid piston). Your solenoid will scream like a banshee, but eventually the click will become less audible.
Team No Name Crew - NEXL Exalted - foXball
Matt's Outback Paintball