Upgrade to premium nickel boron bolt carrier group for your AR build

Description

These bolt carrier groups are plated with nickel boron, which gives three distinct advantages:

• Harder than chrome and nitride, so they are very resistant to wear.
• Very slippery, so the gun operates smoothly, even under extreme conditions (this is not a replacement for lubricating the gun though).
• The silver color provides a stark contrast to the gun and just looks cool, especially when matched with the nickel boron trigger.