There's no easy way to scrape carbon out of the star chamber of an AR15 unless you're a surgeon. That's why most shooters use a star chamber brush to loosen the carbon - then remove it with a star chamber cleaning pad and a healthy dose of solvent. Done deal. Now go back to shooting. Note-Intended to be used with the Real Avid AR-15 Chamber BossFeatures20 wool chamber pads per packageRemoves loosened carbon from star chamberEvenly distributes solvents and lubricantsPrecision cut to fit standard .223/5.56 AR15 star chambers