The Cleaning Stars from Tapco are designed to effectively clean the chamber lugs of your AR15 or M16 rifle. This hard-to-reach area is often neglected by shooters. However, they can easily become clogged with carbon residue, as well as the remains of the lubricants and solvents that you use to maintain the easier-to-reach areas of your weapon. A poorly maintained chamber lug can interfere with chambering, and leftover solvents can also cause corrosion. These specially shaped brushes attach easily to a standard bore brush to remove unwanted substances from the area to maintain a smooth action.