Fail Zero M16 M4 Extreme Duty Kit EXO Coated Upper, Bolt Carrier Group and Hammer Matte Grey Finish

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A completely assembled, ready to install M16/4 Bolt* and Carrier System, including an Upper Receiver and charging handle for extreme duty use. Kit includes eight critical parts that are treated with EXO Technology, a revolutionary surface technology that provides permanent dry lubricity, radically improves 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 all stated in Basic Kit with the addition of Upper Receiver and Charging Handle. This kit will have a life of over 30K rounds.

Specifications and Features:
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
Firing Pin and retainer
A4 EXO fully coated Upper Receiver with M4 feed ramps, matte grey finish
EXO coated Charging Handle
*Note: Firing pin and retainer included in kits.