AR15 / M4 Replacement & Upgrade Bolt - Carpenter No. 158® Steel - MPI & HPT

$ 47.49

The Ground Zero Precision bolt assembly is precision machined from Carpenter No. 158® steel to specific U. S. military specifications and is shot peened for unsurpassed strength and durability. complete with a precision machined tool steel extractor, extractor spring, and every single one is Magnetic Particle Inspected (MPI), High Pressure Tested (HPT) and is marked MPI.

  • Manufactured to U. S. Military Specification from Carpenter No. 158® Steel
  • MPI Bolt (Magnetic Particle Inspected)
  • HPT Bolt (High Pressure Tested)
  • Precision Machined & Shot Peened Bolt
  • Tool Steel Extractor
  • Spring Steel Extractor Spring
  • Black Extractor Insert
  • Mil-Spec O-Rings
  • .223, 5.56 & 300 Blackout