Exactly that!Ammo, magazine spring/follower/feed lips, extractor. In that order.
Recoil spring may be too stiff for the ammo and slide doesn't go back far enough. Main spring needs to be just strong enough to set off primers reliably.
If you're not familiar with the gun and not sure what and how to do, either get a shop or smith help you with that as it's a safety and liability issue.