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, if you want to compare with this one.