Not sure but a GTX/Charlie da tuna trigger may be available for your rifle.If this rifle does not start behaving real soon its going back to Crosman for a replacement. I have dropped big game at over 600 yards so I know it isn't me!
You are right about the trigger, it sucks! Can it be adjusted?
http://www.airgunsource.com/gtx-gen-ii-trigger/dp/2232