Upgrade your AR-15 with this Nickel Boron (NiB) bolt carrier group, designed for smoother operation and long-lasting performance. The NiB coating reduces friction and wear, improving reliability while making cleaning easier. Compatible with .223 Remington, .223 Wylde, and 5.56x45mm NATO, it features a durable nickel-plated silver finish for added corrosion resistance and a clean look.