The CMMG AR-15 Bolt Assembly is expertly designed for 5.56mm NATO cartridges offering exceptional performance and reliability for your AR-15 rifle. Crafted with precision this bolt assembly features a sleek black finish that enhances durability and resistance to wear. Perfectly compatible with AR-15 models it ensures smooth cycling and consistent operation making it an ideal upgrade for firearm enthusiasts seeking enhanced functionality and longevity in their shooting experience.