AR-15 Bolt Carrier Group

Nickel Boron BCG

So why is nickel boron so great? For that, here’s a little science. Nickel boron (NiB) is a columnar-formed compound. It’s about 95 percent nickel and 5 percent boron. Due to its formation, it reduces contact points between surfaces. However, it still provides an additional layer of hardness to the steel. Because of the reduced surface contact—given only the rounded ends of the NiB column’s touch—it acts almost like a lubricant.

What does this all mean as it relates to our nickel boron bolt carrier group? Compared to standard chrome, nickel boron provides more resistance to wear and corrosion; that’s important because it means you get a bolt carrier group built to last much longer than anything else you’ll find on the market. Longevity is exactly what you want from your bolt carrier group. The end result from our work is an 11.6-ounce bolt carrier group that we’ve tested every possible way to withstand whatever you throw at it. In case you were wondering, here’s a look at exactly what makes up our nickel boron BCG.