Originally Posted by Helix_FR
No they are offen referred as mainsprings. You can't tell if a spring is stock from pictures. Even if it is stock the worn slide can contribute to it not cocking. A conbination of worn rails will also cause issues. rack the slide by hand but pull up on it at the same time. See if the hammer cocks.
IT cocks bak jus fine by hand but doesnt reset hammer after shooting for next rnd