Kleen Bore Military Style Chamber Brush .223 5.56mm Cal. 223 or 5.56mm Caliber M16C was originally designed for use by the military for M16 AR15 and AK-47 rifles but now it can be used for your rifles at home. This cleaning kit is designed to clear the chamber of your .223 or 5.56mm rifle efficiently and safely. Two types of brush provide multi-level scrubbing in this Kleen Bore product: the phosphor bronze brush cleans the chamber while the stainless steel brushes are used on the bolTlock area. Kleen Bore Military Chamber Brushes also feature a #8-36 thread that can be used in conjunction with most other Kleen Bore cleaning kits. Utilize the Kleen Bore Military Style .223 or 5.56mm Chamber Brush to keep your rifles spic and span inside and out. Specifications for Kleen Bore Military Style Cleaning Brush: Caliber: .223 or 5.56mm Features of Kleen Bore Bronze and Steel Chamber Brush: Designed to clear chamber of assault rifles Includes phosphor bronze brush and stainless steel brush Used for .223 and 5.56mm caliber rifles #8-36 threading Package Contents: Kleen Bore Military Style Chamber Brush .223 or 5.56mm Caliber M16C KleenBore 1009970: Chamber Brush .223/5.56mm Caliber 8-36 Threads