This AR-15 Complete Bolt Carrier Group is expertly crafted for reliability and performance. Constructed from durable 8620 steel it features a phosphate coating for enhanced protection and longevity. The interior and gas key are chrome-lined ensuring smooth operation and reduced friction. Fully assembled and ready to install this bolt carrier group is an excellent choice for upgrading or building your AR-15. With its sleek black finish it combines both functionality and style.