Glock appears to have improved the quality of their extractors lately. The 9mm non dipped LCI and the latest 40 (still dipped) LCI extractor I have ordered have been of much better quality then the previous mim extractors they replaced. The extractor in my 2009 G22 was was mim and showed significant wear marks on the top and bottom.
Hopefully they have figured out how to make good extractors like they used to.
Gen 4 - 17, Gen 2 - 19, Gen 2 - 20, Gen 3 - 22, Gen 4 - 23, Gen 2.5 - 27