A Kahr pistol will not chamber the round if you "ride the slide". You have to release it and let it return via the recoil spring.
I don't know of any gun that cannot take the impact of the slide releasing on an empty chamber but maybe there is one. Please let me know which one it is so I can amend my beginner's guide with advice to avoid buying that one :)
FWIW some pistols don't even have a slide stop and won't lock the slide open anyway IIRC.