The KAK Industry carrier completion kit for the AR-15 is a comprehensive, high-quality kit designed to provide everything you need to finish assembling your bolt carrier group. Crafted from premium materials, this kit includes essential components such as the firing pin, cam pin, retaining pin and bolt gas rings, all designed for optimal performance and reliability. Whether you're building a new rifle or replacing worn-out parts, this carrier completion kit ensures smooth operation and consistent cycling of your AR-15. Perfect for those looking for a durable, cost-effective solution to complete their build, the carrier completion kit guarantees dependable function and long-lasting durability for your AR-15. AR-15 BCG cam pin 4140 steel, Swiss turned, heat-treated, phosphate finish, ensuring a robust and reliable pin for smooth operation and durability Mil-Spec AR-15 M16 556 BCG firing pin machined to the Mil-Spec print from high-quality 8740 steel, precision ground, properly heat-treated, chrome-plated, providing reliability and durability Material high-quality 8740 for strength and durability, built to withstand extreme pressures Fits all AR-15/M16 style carriers for broad compatibility across various AR-based systems Includes cam pin, firing pin and retaining pin, providing all necessary parts for assembly and operation