Because the AK is mashed up :p
Don't know if there is a real version, maybe some gun enthusiast can build this?
medium length barrel similar to AMD-65, G36-like buttstock, Kbk Beryl fire selector, etc..

inscription below 'EBR-KII' is my Pixiv ID number written in Javanese numbers, 4347539

UPDATE:
Changed skin color to lighter color. The previous was too dark.
Hair is edited. Looks like better this way.
The previous version is still preserved on "my pixiv,":http://www.pixiv.net/member_illust.php?mode=medium&illust_id=53527910 if you want to compare with this one.