i had the same prob one my ksc mac11. i took it apart to find a couple of bb's stuck on the left side of the air nozzle in the ejection port. i removed the 2 stuck bb's and lubed my gun. after i put it back together it worked fine. if u don't have any stuck bb's, u might wanna try to just spray ur internals with some silicone oil. i find that my guns works way better after some lubrication.
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