Toolcraft 5.56 Black Nitride Bolt Carrier Group

Price: $149.00
SALE PRICE: $99.00
  • Item #: Toolcraft 5.56 BCG - Nitride
  • Manufacturer: Toolcraft
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Toolcraft 5.56 Black Nitride Complete Bolt Carrier Group.  Bolts are available in 9310 or C158 steel (choose your preference from the drop down menu above).  Bolt carriers are available with or without logo (choose your preference from drop down menu).  Other coating options are also available on separate product pages.  All manufacturing, coating, and laser engraving is done directly by Toolcraft to ensure a premium product with strict quality control.  These BCG's are completely assembled and drop in ready.

Caliber:  5.56 / .223 / 300 Blackout

Finish: Black Nitride

  • M16 style carrier
  • Material: Aircraft Quality 8620 Steel
  • Gas Key: 4130 Steel
  • Grade 8 Gas Key Screws - Properly Staked
  • Forward Assist Serrations
  • With or Without Laser Engraved GRO Logo (choose from drop down menu above)
  • Bolt Material: 9310 or C158 (choose from drop down menu above)
  • Extractor Material: 4140 Steel
  • Mil-Spec O-Ring
  • Mil-Spec Gas Rings (3)
  • Cam Pin Material: 4140 Steel
  • Firing Pin Material: Hard Chrome/Ground 8740
  • Other: MPI Tested, Shot Peened


Black Nitride is a process commonly referred to as SBN (Salt bath nitride) and QPQ (quench polish quench). These are a form of nitrocarburizing or a Thermo Chemical treatment that improves wear resistance and corrosion resistance of ferrous metals with little or no dimensional change which causes the hardening of steel. The chemical bath results in a deep dark black with a harder, more durable finish.

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