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

Description

• 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