Spike's Tactical M16 Bolt Carrier Group Lightweight Nickel Boron
High-Performance Nickel Boron Coating: Durability and Performance in One Package
Coatings - Toolcraft, Inc.
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
Bolt Carrier Group Coatings and Treatments
OVERVIEW: Parallax Tactical's New Titanium Nitride Hard Coated Nickel Boron BCG | Firespeed Tactical