American Built Arms Co.

5.56 Mil-Spec+ Bolt Assembly (Nickel Boron Coated Bolt)

Ready to drop into your bolt carrier group. These Bolts are specially made on high end Swiss machinery to have exacting tolerances and surface finish. A*B Arms is known by rifle manufacturers for manufacturing one of the finest quality bolts and extractors available. This has won us contracts with some of the highest quality AR manufacturers in the business. If you want to buy super high quality parts offered by the company that actually manufactures them, then you've come to the right place.

Bolt

  • Carpenter 158 Steel
  • Heat treated per Mil-Spec Requirements
  • Shot Peened per Mil-Spec Requirements
  • MPI Tested Material
  • 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

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