Fail Zero M16/M4 Nickel Boron M16-Style Bolt Carrier Group (BCG) - .223/5.56

Product Description

Fail Zero M16/M4 Nickel Boron M16 Style Bolt Carrier Group

A completely assembled, ready to install M16/4 Bolt and Carrier System. Kit includes critical parts that are treated with EXO Technology, a revolutionary surface technology that provides permanent dry lubricity, radically improves the performance of your M16/4 and eliminates the need to apply oil or grease to treated parts for the life of the weapon. Treated parts include; Bolt, Bolt Carrier, Extractor, Cam Pin, Carrier Key.  Quality features include:

• .223/5.56 Caliber
• Case Hardened, Shot Peened and MPI Bolt (Magnetic Particle Inspected)
• EXO Coated Bolt (40% more wear resistant than Chrome with a very Low Coefficient of Friction)
• Mil-Spec Gas Rings
• EXO Coated Carrier
• Gas Key with EXO Coated Exterior and Chrome Lined ID.  Hardened to USGI Specifications 
• Mil-Spec Staked Gas Key
• Grade 8 Hardened Fasteners
• Black Extractor Insert
• 300 Blackout Compatible
• Firing Pin and retainer