Quote Originally Posted by ggggr View Post
never done one of these or even seen one . The parts diagram looks pretty complicated as well. If you think that the trigger is ok, then try taking the mainspring out of the gun and remove the cocking arm. Slide the piston back with a rod/screwdriver or similar and see if the trigger engages fully and holds when you pull against the piston. If it does then there is a fair chance that your trigger is ok and the problem is that the piston is not coming quite far enough back when the gun is cocked. This could be down to the piston being worn where the cocking arm pushes (probably see signs of wear) Or maybe the cocking arm has been bent.
This is a pretty good thing to try with any gun that does not cock. If the gun has problems cocking, people tend to swing on the barrel and make matters worse. had a few guns with slightly bent cocking arms with this problem.
Sorry I cannot help more but the basic check may save you spending money on bits you dont need.
the trigger is not complicated(easy to strip)the piston is fine,the cocking arm is straight,when cocked it sets the safety & trigger,the sear clicks onto the piston for a fraction of a second then releases,and theres no wear on either the sear or piston!!