Professional shooter, I guess sponsored by CZ and I think head of CZ Custom. Someone asked him once if a specific model of CZ was rated for +p, and that was his answer, they all are for a little while.Who's that? And having said that I used to have a G42. Only reason I don't still is someone offered me stupid money for it. I shot some +P through it and never had a problem. I think the only reason a factory will advise against a steady diet of more powerful ammo is ..lawyers. FWIW I had an older G17 and I shot a few codes of UZI black tip ammo through it. Didn't hurt it.
https://cz-usa.com/angus-hobdell/