LBE Unlimited Extractor Kit, Fits AR15 Bolt Carrier Group, Black Includes Extractor, Spring, O Ring, Buffer Insert and Roll Pin AREXTKT LBE Unlimited is a leading producer of US Made gun parts and accessories" particularly for the AR-15 platform. Whether you're in the middle of an AR build or you're just looking to upgrade a key component" LBE has you covered with reliable parts and accessories to fit your distinct needs.