Is Glock factory installing Ameriglo sights now? They’re across town from Glock USA, so it would make some sense. I know Ameriglo’s owner, he lives a couple miles away. Ameriglo sights are what the FBI wanted on their Glock M17s and M19s, and the Glock Gen 5s are just the FBI contract Glocks without the M rollmark.
Gen 5 Glocks are available with Ameriglo sights as optional, so you will see some Gen 5s with, and some without.
I recently obtained a Glock 43 with a stock front Ameriglo sight. Nice little concealed weapon, even if it is a 9mm...