The AR15 brush combo contains the critical components you need to keep your AR15 chamber and bore carbon free. It contains a star chamber brush and star chamber mop for cleaning inside the hard to reach star chamber. Star chamber pads help collect left over carbon while applying the perfect amount of oil or solvent. The .223/5.56x45mm bore brush scrubs baked on carbon from lands and grooves. Features: All components work with standard 8 inches - 32 threads