Velvett is right. I have a G34.
Also, after You pull the slide and eject the round, put the magazine in, the trigger stayes cocked. To release it You would have to pull the trigger(dryfire) which is not the best solution. That is why I carry this plastic round with a little spring inside to save the firing pin. I put the magazine in with the "plastic"( I do not know the exact matching word in english, sorry) first, pull the slide which inserts it into the chamber, pull the trigger(it does not fire the round and saves the firing pin) and put the glock in my holster. That way when I draw and pull the slide that plastic round is ejected and the gun is ready to fire.
Hope this helps.
js