The breech brush makes cleaning the removable plug in you firearm a snap with the ability to clean both the threads in the barrel and the receiver. The Fire Channel brush cleans and helps to eliminate any blockages in the fire channel of most inline breech plugs. The Fire Channel brush can be used in conjunction with T17Â Breech Plug Cleaner. Notice for California consumers: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov