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