M9 recoil spring makes?
 

I am unable to locate a guarder recoil spring for my M9 (KJW). I know that Marui springs should work but I've had no luck - does guarder even make them? What about Nineball? I hope to look for a 150% one. I've had experience with the guarder one that I put in my p226 and it helped/worked flawlessly ever since.

See the button called International Retailers? Click it, check their websites, use their search options.
If it's available, it will be listed.