Brownells Chamber Brush Features The Brownells Chamber Brush follows the original military design that has cleaned AR-15 and M16 chambers reliably for decades. Bronze bristles are shaped to conform closely to the chamber walls lifting fouling without damaging the metal while longer stainless steel tufts reach into the locking lug recesses where carbon buildup tends to collect. Meeting Mil-Spec MIL-B-20100C this brush is built to the same standard the military relies on for issued cleaning equipment. It measures 3 7/8 inches overall and threads directly onto a Cleaning Rod Small Arms using the military 8-36 thread pattern. Regular chamber cleaning supports reliable extraction and consistent chambering both critical to safe repeatable function in a gas operated rifle. This brush is sized to fit Colt M16 rifles as well as standard AR-15 pattern chambers giving owners of either platform a mil-spec accurate cleaning tool. Because it threads directly onto a military pattern cleaning rod it integrates easily into an existing cleaning kit without adapters. Brownells offers this chamber brush as a dependable mil-spec cleaning solution for AR-15 and M16 owners. Brownells Chamber Brush Specifications Manufacturer: Brownells Model: Chamber Brush Caliber: .22 Caliber Length: 3.875 Cleaning Rod Threads: 8-36 Male Meets Mil Spec: MIL-B-20100C Compatible Hosts: Colt M16 AR-15 Available At: GrabAGun