Mil-Spec
Individually 9310 MPI tested Bolt
Carrier: 8620 Tool Steel-(M16 full shroud)-Heat Treated, Case Hardened
Gas Key: Tool Steel-Attached using Grade 8 Hardened Fasteners, & Staked.
Cam Pin: 4140 Steel
Extractor:Tool steel-shot peened
Coating: Melonite
Full auto rated