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The problem is user error, due to the AK "rocking it in" style of magazine, practice is imperative for a GBBR, just keep practicing.
Lastly, because of the AK has a lot of "dead space" which results in a long bolt cycle, it has to travel a long way to cycle for the next shot, however there is a part that you can install to give a higher ROF and better cooldown. By installing a speed recoil. you cut the travel time in half.