ERGO AR-15/M16 9MM BOLT CARRIER GROUP (BCG)

Bolt Carrier Group Features:

• True Mil-Spec Bolt Carrier Group
• Material: Case Hardened 8620 Steel
• Finish: Black Nitride
• Gas Key: 4130 Steel attached with Grade 8 hardware and properly staked
• Cam Pin: Hardened 4340 cam pin
• Firing Pin: Mil Spec firing pin made of 8740 steel, center-less ground and Hard Chromed
• Bolt Assembly: The Bolt is Mil Spec dimension and external surfaces are CNC ground after heat treat for a precision fit
• Bolt Material: Case Hardened 9310 Steel.
• Finish: All Bolt components Shot Peened and Black Nitride (except extractor)
• Extractor: 4340 Steel , Manganese Phosphate coated
• Mil Spec Extractor Spring and O-Ring Combination
• MPI: Magnetic Particle Inspected
• 100% Made and Assembled in the USA
• Bolt: 9310 material, shot peened, MPI tested and hard engraved