Every tool you need to easily eliminate baked-on carbon from the AR15 chamber. All implements store inside the ergonomic handle. The handle self-centers inside the upper to perfectly align with the barrel extension lugs. Easily spin the handle while making precision contact for all implements inside the chamber. Makes easy work of removing carbon. Included is the handy Pivot Lock to hold your gun open while cleaning. The smartly designed Chamber Boss - AR15a |Fast, Easy, Effective. Mfg: Real Avid