Don't know if this helps any, but I dipped my BCG in an container with brake parts cleaner and it attacked all the carbon buildup, used a fine nylon bristle brush and it worked out just fine.
I'll wait for your pics for comparison against my BCG.
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You can have my weapon, when you pry it from my cold dead fingers!
Weapon: LMT308MWS x 2, Timney Trigger, WCI Titanium Muzzle Brake, LMT FDE Sopmod, FDE Ergo Grip, UTG Folding Billet Aluminum Forearm Grip, Magpul Pmag 20LR, Magpul FDE MS2 Multi Position Sling.
Scopes: Burris Eliminator Laserscope, Nightforce 5-22x50 NXS with Zerostop Turrets.
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