6.5 Grendel Type 2 bolt face - Black Nitride Bolt Carrier Group. - Technical Specs - Type 2 6.5 Grendel bolt face. - True 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 Assembly: The Bolt is true 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 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
Determined at checkout.