I know for the mistake, the black version also has wrong spelling on the markings. But, compare to the KWA who has no markings, it's still better!
How does it shoot: 350fps +-
What does it sound like: watch the vidéo and you will hear the sound
How accurate: I have never done grooping test, sorry guys
In my text I think I'm explaining a lot about how it works. Do you have others specific questions?
About compatibility, both my KJW and KWA weren't compatible with anything else. I always use the company mags.
Thanks for the feedback, I don't have new guns often because they cost so much, so I can't practice my reviewing skill ^^