It may be a carbon ring build up in the front of the chamber , there is a lot of stuff on the net about it Google Carbon ring in barrel .
My blued barrels always show black no matter how much JB I use , my stainless ones come clean realy quickly
It may be a carbon ring build up in the front of the chamber , there is a lot of stuff on the net about it Google Carbon ring in barrel .
My blued barrels always show black no matter how much JB I use , my stainless ones come clean realy quickly
Get as close as you can then six feet closer
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