Talk:STG-44/@comment-184.57.198.222-20120908073901/@comment-11356046-20131222165026

haha, oh wait, you were serious?

The AK's outside design was derived from the STG, such as the use of the shortened rifle cartridge and the general outward look of the STG, but how they are mechanically different. One is a gas operated rotating bolt while the other is a gas operated tilting bolt

TL;DR

AK is not an "improved" version of the STG44. They simply borrowed some concepts from it. A simple google search can even tell you that.