My understanding is they are replicas. And replicas fire real bullets. You can tell the author is clueless.
.
We need Diva Control.
.
I have been watching some real cheap 1950s horror movies from way back then.
I noticed the revolvers they used went Bang but no flash or gas exited the barrel. This told me the BANG was dubbed in using guns without blanks or any ammo. A true Cold Gun.