My recently purchased42 has an "03" stamped on each of the magazines which I've found out indicates this is the 3rd generation of magazine it has been sold with.
In close to 200 rounds I have had no problems though, not sure if the 43 magazines are on a 3rd generation yet. It launched after the 42 so maybe they have only have had 2.

"Every record has been destroyed or falsified, every book rewritten, every picture has been repainted, every statue and street building has been renamed, every date has been altered."
― George Orwell, 1984