Pro Shot Brushes were made specifically for your AR-15 and built tough so they can be used. All Pro Shot products are proudly made in the USA of all USA made components. Pro Shot stands behind all of our products and you can feel rest assured you have the finest built in USA product available.Specifications and Features: HD nylon bristles wont deteriorate when used with solvents or oils Heavy duty stiff nylon bristles with brass core and coupling that is wound through the brush coupling for added strength and durability Nylon Bristles resist ammonia and oil-based cleaners All Pro Shot brushes are Proudly made of USA components and assembled in the USA, #8-32 Threads Fits Standard American Cleaning Rod with #8-32 Threads