Classic army AK making grinding noises on full auto
So I have had a classic army RPK for a few years now but haven't been able to use it. When firing full auto, it sounds like it's making a grinding noise every few shots and the bbs sort of roll out of the barrel, however it fires flawlessly on semi, and dry fires full auto no problem. I've tried cleaning the barrel, but other than that I'm not sure what to do. Any suggestions as to what this could be?
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