Unload the gun. Double check. Now rack the slide 100 times.(or more) Then leave the gun with the slide locked back for a few days. Be sure you have cleaned and lubed to pistol correctly..
You do not need to replace parts.



Learn to the rack the slide by holding the slide firmly and pushing the bottom frame forward, rather than trying to "Pull" the slide back. Have shown many women ( a few men) shooters how to do this, It is a world of difference.

Overhand grip on the slide with weak hand, forward push with strong hand
Push rather than pull.