No, the Glock 19 kit does not include compatible magazines for the 19x.
Please email us at techsales@opticsplanet.com regarding the issue you are having so we can help you with the Advantage Arms Glock Gen 5 .22 Long Rifle Conversion Kit.
You can find a threaded barrel compatible with the Glock 19 Advantage Arms Glock Gen 5 .22 Long Rifle Conversion Kit that you can find using the following link:
https://www.opticsplanet.com/advantage-arms-glock-19-23-22-lr-threaded-conversion-barrel-w-adapter.html
This Advantage Arms Glock Gen 5 .22 Long Rifle Conversion Kit will only be compatible with either the Glock 19/23 gen 5 or 17/22. Unfortunately, there is no conversion kit compatible with the Glock 48.
We do carry one for the G19. We carry one for the G17 but it's not for the Gen 5 model. Here's a link for the G19 threaded barrel.
https://www.opticsplanet.com/advantage-arms-glock-19-23-22-lr-threaded-conversion-barrel-w-adapter.html
This barrel should fit that pistol.
https://www.opticsplanet.com/advantage-arms-glock-26-27-22-lr-threaded-conversion-barrel-w-adapter.html
This conversion slide uses standard Glock sights, so you could replace it with normal Glock sights or a red dot mounting plate.
This kit will not fit a Glock 34 Gen 5.
No, it will not.
This is the incorrect one for your firearm. Here's the one that would work for you:
https://www.opticsplanet.com/advantage-arms-glock-19-23-22-lr-conversion-kit-w-10-round-magazine-and-range-ba.html