Mil Spec AR-15 Bolt Carrier Group


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

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.


Additional information

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

NP3, NP3+

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