TAPCO Military Style AR-15 Chamber Brush - The TAPCO Military Style Chamber Brush has a heavy-duty nylon chamber brush that cleans both the chamber and star chamber/ locking lug recesses of your AR Platform rifle. The longer smaller part of the brush reaches the chamber area, while the larger diameter is meant to reach the star chamber/ locking lug recess area. Heavy-duty nylon bristles resist breaking down with the use of solvents/CLP.