Brownells Chamber Brush Features The Brownells Chamber Brush follows the original military design used for decades to keep chambers free of fouling and carbon buildup. Bronze bristles are shaped to conform closely to the chamber walls for an effective clean without damaging the metal while longer stainless steel tufts extend into the locking lug recesses where fouling tends to accumulate. This AR-308 and AR-10 sized version measures 4 3/8 inches overall and threads onto a standard cleaning rod using an 8-32 male thread. Meeting Mil-Spec MIL-B-20100C it is built to the same standard trusted for decades of chamber maintenance. Regular chamber cleaning helps maintain reliable extraction and consistent chambering particularly in gas operated rifles that generate significant carbon fouling with each shot. This brush is sized specifically for .30 caliber AR-308 and AR-10 pattern rifles ensuring the bristles reach the full depth of the chamber and locking lug area. It threads directly onto any cleaning rod fitted with the standard 8-32 thread making it easy to add to an existing cleaning kit. Brownells offers this chamber brush as a reliable mil-spec accurate tool for keeping a .30 caliber AR-308 rifle running at its best. Brownells Chamber Brush Specifications Manufacturer: Brownells Model: Chamber Brush Caliber: .30 Caliber Length: 4.375 Cleaning Rod Threads: 8-32 Male Meets Mil Spec: MIL-B-20100C Compatible Hosts: AR-308 Available At: GrabAGun