An overlay comparison on gunhero.com of the Glock 19 and the Ruger RXM shows different grip angles. The RXM compared to the S&W M&P 2.0 shows the same grip angles.

I own both OEM and Magpul mags for my G19 and have never had problems with either. The only drawback I’ve found to using the Magpul magazines is the lack of a metal liner means they don’t work with a NeoMag magazine carrier. Aside from that, they’re a good alternative.

https://www.shootingnewsweekly.com/gear-review/good-gear-neomag-magnetic-pocket-magazine-holder/

Glock OEM polymer magazines are metal lined; Magpul polymer magazines are not metal lined.

I understand that the earliest Glock magazines were unlined, followed by a partially-lined version, and finally becoming fully metal lined, as they are today.

Are the fully metal-lined Glock magazines superior to the unlined MAGPUL magazines?

I use only Glock OEM magazines. I will leave it to those who use MAGPUL magazines rather than Glock OEM magazines to explain their reasoning if they should choose to do so.

The bulk of what I think I know I have learned from others.

“Of course, the main draw to the G47 MOS is the modularity. With the shortened dust cover, you’re able to swap slide assemblies with the Gen 5 Glock 19s and Gen 5 Glock 45s. If you want a little bit extra concealability, throw a G19 slide/barrel on there.”

This was pushed as a big selling point of the G47 (similar to a G17 in most other respects) because previous Glocks (including all Gen 3s) could not do this.

One of the most recent Glocks made a big deal of the fact that it used interchangeable 19 and 17 length barrel-slide assemblies because previous versions (including all Gen 3s) were not.

And why didn’t Ruger design it with an ambidextrous slide release?

Slides are interchangeable.