Real Avid : Carbon Boss - AR15. A MERCILESS ARMY TO CONQUER CARBON This is the most comprehensive carbon removal multi-tool ever built. Extremely versatile, it has 12 precision surfaces to clean the most critical parts of your bolt, bolt carrier, cam pin, and firing pin. It also includes a cotter pin puller, a replaceable rotating phosphor bronze brush, and an imbedded bolt tail detailing brush. It’s the enemy of your AR15’s worst enemy.