I have never had an issue with plastic build up in chambers, but for plastic deposits in barrels and chokes, I apply carburetor cleaner, let it sit ten minutes, then use a cotton patch wrapped around a bore brush. You could dd an extra patch or two to clean the chambers. I find that using a bore snake with the built in brass brush, after every use, really helps to greatly reduce plastic deposits in barrels and chokes.
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Only accurate guns are interesting.
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