AR-STONER(TM) offers replacement components for the AR-15, LR-308 that are made to strict military specifications. These high quality components provide excellent fit and reliable function. AR-STONER(TM) parts are perfect for upgrading existing components or replacing worn or broken parts. Includes (2) set screws. Features:Low-Profile DesignSet Screw Design for Secure AttachmentGreat for New Builds or Replacing Worn Parts