I have found that the culprit is sometimes the carbon build up that creates a ceramic like fouling and copper solvents will not cut it . Try soaking and scrubbing with a bronze bristle brush ( not nylon )and carberator cleaner . It may take 2 or 3 brushes and lots of elbow grease .I like to let it soak for a while .Don't let it touch the stock. I also will saturate bore with kroil while in storage .
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