Mil Spec AR-15 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.



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 NP3. All parts are machined, heat treated & finished to US mil-specs all steel is correct including 158 Carpenter steel for the bolt.  The bolts are shot-peened, heat treated, and 100% Magnetic Particle Inspected per US mil-spec.

ROBAR AR15 Bolt Carrier Group specs:

  • Bolt Carrier – MilSpec 8620 Steel Shot Peened
  • Bolt – Carpenter 158 Steel Shot Peened and Pressure Tested, then Magnetic Particle Inspected
  • Extractor – 4140 Heat Treated with Black Nylon Extractor Spring Insert, M16 MilSpec Spring, and NSW Crane O ring
  • Plated with NP3 or NP3Plus


Additional information

Weight 1.5 lbs
Dimensions 6 × 4 × 4 in
NP3 or NP3+

NP3, NP3+

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