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The issue with your gun is the hopup. The grub screw stripped the thin metal that presses down on the hopup rubber. To the best of my knowledge, you can't get after-market parts.
However, you should be able to replace the whole chamber / outer barrel / hopup assemly with a TM one. They're different than the KJW design, but I've been told if you replace the whole thing, they do work. I can't 100% guarantee that since I've never tried it myself, but it's what I've been told.
So assuming what I've said is correct, you need what's in your original post, but designed for TM instead of WE. I don't know how close WE is to the TM or KJ design, so I can't really comment on it. I've never even seen a WE M9 in person.
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