The fully assembled AR .223/5.56 bolt carrier is ready to install and use. Made from top-grade materials and designed for reliable performance this bolt carrier is a great choice for your rifle. Get yours today and take the first step towards improved accuracy and performance. Built from 8620 Steel heat treated to Army specifications the TiN coating enhances wear resistance reducing friction and improving overall reliability. This cutting-edge technology ensures smoother cycling minimal carbon build-up and easier cleaning resulting in unmatched performance and extended service life. Includes: Bolt Carrier Carrier Key Firing Pin Cam Pin Firing Pin Retaining Pin Bolt carrier key screws (2)