Breakthrough Clean Technologies, Modern Sporting Rifle (AR-15) Carbon Removal Tool, Ergonomic Handle California Prop 65 WARNING. These products contain a chemical known to the state of California to cause cancer, birth defects and other reproductive harm. Lead: Cas-No. 7439-92-1 Scrapes carbon buildup from hard-to-reach areas like the bolt carrier group, bolt, and firing pin, minimizing malfunctions and jams Ergonomic handle gives you a firm comfortable grip to effectively scrape off carbon build up Double-ended scraping tool blades easily retract into handle Compact and portable so you can slip it in your range bag or toolbox at home Product Description Breakthrough Clean's Carbon Removal Tool easily removes Carbon build-up from hard-to-reach areas on your firearm. With its integrated handle and double ended blade tools, removing stubborn carbon has never been easier. To use, push forward on the lever on the back side of the handle, grab and pull the tool blade end out until it clicks. To retract, push the round button down, and push the tool blade in until flush with the handle.