Interesting thing for those that may be affected. I bought my Glock 42 last year on release day. Has a test fired date of 12-13-13. I had a lot of issues with flat nose(truncated) ammo from day one. I called Glock last year and was told to shoot different ammo by the tech that answered.

Well I shot it over the weekend and had similar issues. Now I haven't had any issues since last year. When I went to researching I noticed that they have started making changes. Called again and this time they were more than happy to get it in for repair and look at it.

What was interesting is when I researched that they silently made changed back in May of last year. Newer models are marked with a 1 on the frame and a couple of other places. As well as newly designed mags. I confirmed this when I went to my LGS today.