Nickel boron nitride anti-friction process applied to the barrel. NBN is better than polishing, better than Teflon, does not add dimensionality and cannot flake off. I did the hammer and trigger bar
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![Top 3 Reasons You Might Want A Nickel Boron BCG [2023] - SpiceTac | AR-15 Parts](https://www.spicetac.com/product_images/uploaded_images/spicetac-toolcraft-gif.gif "Top 3 Reasons You Might Want A Nickel Boron BCG [2023] - SpiceTac | AR-15 Parts")
Top 3 Reasons You Might Want A Nickel Boron BCG [2023] - SpiceTac | AR-15 Parts
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