Things I noticed, anyone know of anything else?
1. There is the nDLC finish on trigger bar not on Gen5 that is stock on the M part number 33588. Gen 5 trigger bars are marked 39701. In pictures a lot of M triggers appear black vs bare metal.
VS this image of my G17.5 trigger bar and internals.
2. M models seem to have Glock OEM part number 8794 extended magazine catches stock. Some M pistols have ambi extended slide stops Glock part number unknown, which are shown in the new Gen 5 users manuals but seem not available for purchase yet for commercial pistols.
3. Gen 5 THM are the same as the M series and are marked 33667 with a 2 below the part number. Possibly revision 2?
4. The name of the version on the side of the slide.
5. Barrel hood has a 5 on it. M series say 5M.
6. M versions have option of contract (FBI) sights vs bold Ameriglo. FBI sights pic below.
Other than that I think they are identical, all other parts are the same. I confirmed that, I'm not guessing.
Pictures from new Gen 5 users manual.
On FB
Old leaked photo from early 2017 of 17M.