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5.56 Mil-Spec+ Bolt Carrier Group with Nickel Boron Coated Bolt and Cam Pin
March 11, 2014
Related To:
American Built Arms Co.
Bolt
Carpenter 158 Steel
Heat treated per Mil-Spec Requirements
Shot Peened per Mil-Spec Requirements
MPI Tested Material Per Mil-Spec Requirements
NIBX Nickel Boron Coated
Extractor
Aircraft Quality E4140 Steel
Heat treated per Mil-Spec Requirements
Shot Peened per Mil-Spec Requirements
Manganese Phosphate Coated per Mil-Spec Requirements
Bolt Carrier Gas Key
- 4130 material, chrome-lined, phosphate coated, staked gas key screws per Mil-Spec Requirements
Carrier
- 8620 material, chrome lined, phosphate coated
Cam Pin
- 4140 nickel boron coated
Firing Pin
- S7 Material and chromed Firing Pin Retainer
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