Pro-Shot Products, Total Fouling Removal Kit, AR-10, Nylon Brushes for Upper Receiver, Bolt Carrier, Bore, and Chamber WARNING: This product can expose you to chemicals including Brass/Lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. Kit Contains the Following Brushes: Upper Receiver Brush, Bolt Carrier Brush, Bore Brush, and Chamber Brush AR-10 Platform TFR (Total Fouling Removal) Kit for the AR-10 Rifle (.308 Cal.) is made with black heavy duty long lasting nylon bristles. These brushes were made specifically for your AR-10 and built tough so they can be used repeatedly. Fits Standard American Cleaning Rod with #8-32 Threads