The LBE Unlimited M-16 Complete Phosphate Steel Bolt Carrier is a high-quality ready-to-use component designed for reliable performance. Crafted from durable 8620 steel it features a phosphate-coated exterior for added protection and a chrome-lined interior for enhanced durability and smooth operation. With a full-auto action and a pre-assembled design this bolt carrier group ensures seamless functionality. Its black phosphate finish adds a sleek professional appearance making it a dependable choice for your firearm needs.