Quote Originally Posted by m4brian View Post
Hence boosters on shorter (7.62) ones?
In theory one might be needed for a full auto, but not for a semiauto. I have literally never encountered a semiauto AK that needed a booster in order to run. The vast majority of AK's are way over gassed. If your AK will run reliably without a booster, adding one only makes the over gassing worse.