Aci maverick?

[PaintBull]

Well ive had my ACI Maverick Deluxe for over 4 years and i never really used it that much. A couple months ago i put some c02 on it (full tank) pumped it. I pulled the trigger and nothing happened. it just uncocked like it normally would. i was wondering how i could fix this? please. thanks for you help.

I did post this in the Pump forum also but i thought i would get more replys here
thanks again