American Built Arms Co.

5.56 Mil-Spec+ Bolt Carrier Group with Nickel Boron Coated Bolt and Cam Pin

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

Loading

Loading

Loading

Loading

Loading

Loading

Loading