I think its 30$. You can buy one from KEE. The number to contact them is 1800-220-3222. Its better though just to go out and buy a good sized screwdriver. It might be saving you 30$. And think of it this way. 30$ can buy you an Ndz bolt, or an Orange bolt or an R.I bolt.
would it be anything to do with the magnet on top of the trigger? Mine fell out before and i could not hear my solenoid click when i had my eyes off and shot with just the gun. I had to super glue the magnet