Looking for that low cost mil-spec 308 bcg thats been MPI and HP's your shit.
Mil-Spec Bolt Carrier Group:

- Material: Case Hardened 8620 Steel

- Finish: Black Nitride. This advanced low friction coating minimizes the need for lubricants

- Gas Key: 4130 Steel attached with Grade 8 hardware and properly staked into a milled “valley” to ensure proper positioning

- Cam Pin: Hardened 4340 cam pin

- Firing Pin: Mil Spec firing pin made of 8740 steel, center-less ground and Hard Chrome coated

Bolt Specs:
- The Bolt is “true” Mil Spec dimension and external surfaces are CNC ground after heat treat for a precision fit

- Material: Case Hardened 9310 Steel. Carpenter 158 is available for an additional charge

- Finish: All Bolt components Shot Peened and Manganese Phosphate or Black Nitride

- Extractor: 4340 Steel , Manganese Phosphate coated

- Mil Spec Extractor Spring & O-Ring Combination

- MPI: Magnetic Particle Inspected

- HPT: High Pressure Test

Made in USA

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