Equipped with an ergonomic, self-centering handle, the Real Avid® AR-15 Chamber Boss™ quickly and comfortably removes carbon buildup, as well as lead and copper fouling from the difficult-to-clean chamber of an AR-15, without marring or damaging the receiver. The Bore Boss automatically aligns with the barrel extension lugs for a precise clean. Once aligned, all you have to do is spin the handle while maintaining contact with the receiver to deliver a consistent, reliable clean. This kit includes 5 wool star chamber cleaning pads, a chamber brush, and a scraper; all of which store conveniently inside the handle when not in use! Plus, the Pivot Lock tool securely holds the upper receiver open while cleaning the chamber for added safety and versatility.