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I'm not too techy, but have sorted a few weird issues out on my M4's lately, so I'll give you something to chew on until a real doctor is in the house.
Its something in your barrel, either the hop-up or dirt. First, try rolling your hop-up completely off and - using the cleaning rod and a long cut strip of paper towel sprayed with silicone oil - spin-clean your inner barrel. Without re-engaging the hop-up, try firing again. You should be good for 10m with no hop-up at all so if its either gritty barrel or bung hop-up causing the problem, it shouldn't be anymore. You can rule these out anyways.
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