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
Firing Pin - S7 Material and chromed Firing Pin Retainer