The AR15 BCG - Nickel Boron is a category that consists of high-quality bolt carrier groups designed for AR15 rifles, specifically coated with a Nickel Boron finish. The Nickel Boron coating enhances the durability, smoothness, and corrosion resistance of the BCG. These bolt carrier groups are manufactured with precision using nickel boron coatings that provide exceptional hardness, reducing friction and wear. This results in improved cycling, reduced maintenance requirements, and increased reliability of the AR15 rifle. With its superior nickel boron finish, the AR15 BCG - Nickel Boron category ensures optimal performance and longevity, making it a popular choice among firearm enthusiasts and professionals.