I recently bought one AN90 and one AK90 on fleabay, measured the balance on my TW balance board, both them came up 4.7pts headlight strung. And I thought they are supposed to be 6 pts headlight strung. I don't get it? I'm pretty sure both are genuine as I did a lot of research on both before buying. What sort of measured balance do you have of your AK/AN90s?