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Seems to in the high horse power 6.5s I’m still yet to find that foam cleaner I keep forgetting to be fair

Give it another scrub with eliminator focusing on the throat make 10cycles front and back threw whole barrel make sure you exit at each end before changing direction leave it to soak for 20 mins...

How many rounds down the barrel? Have you cleaned it could be carbon ring my 6.5 saum was bad for that