Quote Originally Posted by tinbum View Post
I think we've looked at everything with this one Jon, even reverting to the original guide with no top hat, it just won't cock!
will it cock with no guide at all ? (wondering if the rod is slightly off centre or binding in the guide ?)

If it won't cock with just piston into block, there is only the rod / profile left... unless of course you muppets cocked the trigger when refitting and forgot to "fire" it before testing

In fact, have you testing cocking and firing the trigger (using a screwdriver to push from near the main rear stud fitting) ? - maybe a trigger issue as Mick suggested above