Experience superior performance with the Spikes Tactical Nickel Boron Steel Bolt Carrier Group crafted for the AR15/M16 platform. Engineered with precision this full auto BCG features a robust steel construction and a sleek nickel boron finish that enhances durability and corrosion resistance. The bolt carrier and gas key are expertly phosphate-coated and laser-engraved with the distinctive ST spider logo ensuring both style and functionality. Designed to meet military specifications it includes a MilSpec extractor gas key firing pin cam pin and retaining pin all contributing to its reliable operation. Weighing in at 11.60 oz this bolt carrier group is tailored for the 223 Remington/5.56 NATO offering optimal performance for serious enthusiasts.