My understanding is the Gen5s got to be a little thicker on account of the ambi slide release. I don't have calipers to measure exacts but iirc there was some concern at first for holster compatibility between G4/5s. My G45 slides right into my Gen4 holsters and snaps just fine.
Maybe the light bearing holsters have a little more play since it indexes to light vs gun.
Maybe the light bearing holsters have a little more play since it indexes to light vs gun.