Mine is less than a year old and has given me no problems whatsoever. I have four magazines for mine and aside from the two newer mags that I bought being significantly stiffer to load, I don’t see any differences in them.
Just curious, what color are your magazine springs? Are the OEM and the two newer springs the same color code?
I had a slight issue with the last round occasionally stovepiping. It only happened a couple of times. I roughed up the magazine follower with a pocket knife blade and it hasn't done it again. I don't know if that had anything to do with it or not, but it didn't hurt.
Other than that. No problems.
You would see paint on the coils with the magazine unloaded....I cannot say if there may be a paint applied to the top or bottom most coils of the springs....