Mil-Spec Bolt Carrier Groups with NP3 or NP3 Plus


Almost every part of the AR rifle has been improved since its adoption by the military in 1964. Yet most companies still use a process first developed in the 1869 to finish their Bolt Carrier Groups (BCG). It is time to use a plating that is just as advanced as the rest of your rifle. ROBAR is now offering Mil-Spec Bolt Carrier Groups with the choice of NP3 or NP3 Plus. All parts are machined, heat treated & finished to US mil-specs and tolerances. The bolts are shot-peened, heat treated, and 100% Magnetic Particle Inspected per US mil-spec.

Advantages of NP3 on your Bolt Carrier Group

NP3 is a surface treatment for steel and metal alloys that combines sub-micron particles of PTFE (polytetrafluoroethylene), otherwise known as Teflon, with electroless nickel.


  • Increases reliability because it requires little to no oil for lubrication, although we recommend using some oil.
  • Very accurate and even coatings on all activated surfaces.
  • Cleaning is minimal
  • Permits firing for longer periods of time between cleaning, as dirt and powder residue has no wet or oily surface to cling to.
  • NP3 has a micro hardness of 48-51 Rockwell as plated (nickel matrix).
  • NP3 is very corrosion resistant, a 1 mil (.001) coating exceeding a 250 hour salt spray test.
  • NP3 has a high lubricity and low friction co-efficient; therefore, the life expectancy of a firearm will be greatly increased due to reduced friction wear.
  • The coating is strippable with no effect on the base metal, allowing other coatings to be applied or a new coating of NP3 to be applied, if necessary.
  • NP3 plated onto stainless steel guns will prevent galling, a problem common with stainless steel.
  • NP3 is a satin gray, non-reflective color ideal for all firearms.
  • NP3 can be plated to all internal parts giving a smoothness to the action not found with any other coating.
  • In cases where the NP3 has been perforated, the corrosion shows no tendency to spread or migrate under the coating.
  • NP3 is guaranteed against corrosion, peeling or flaking for the lifetime of the firearm.


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