Originally Posted by
philcbr
In one of your photos, you are showing the trigger cocked and the sear engagement part of the piston rod well behind the main sear, so that part of the geometry is correct. Therefore, when the spring is in it is either becoming coil bound, or the end of the piston rod is not long enough to bear on the back end of the main sear in order to cock the trigger, or the cocking lever/slot is mis-matched, such that the piston is not being pushed back far enough.
Happy Shooting!! Paul.
"We cannot solve our problems with the same thinking that we used when we created them" - Albert Einstein.