When I clean my WK180c, I also noticed the spring extractor is *MUCH* weaker compared to my MCX as well.
I haven't had any fail to ejects yet, but now it makes me a bit worried I'll see that problem soon haha...
I've already shot over 500 rounds from mine though without issue, so not sure...
- I also started off mostly using PMC 223, then PPU 223, then American Eagle 223, going to be running at least 250x Barnaul 62g 223's this Sunday, hopefully the extractor doesn't fail.