Guns keep a bullet in the chamber if you eject your magazine and it still had ammo. It’s not necessary, but would be a nice touch. Noticed it in Helldivers 2 video. https://youtu.be/JXdt6JQDSms?si=yY9pKhrRVfkoPQnJ
This is Helldivers 2 gameplay
Animation team actually knows how to use weapons