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These are high grade Bolt Carrier Groups Made in USA.
Specifications and Features
Nitride Finished by H&M Inc
9310 Steel, MPI (Magnetic Particle Inspected) Bolt, Ground per True Mil Spec Specs
8620 Carrier (M16 full shroud) Heat Treated, Case Hardened Steel, Ground after Heat treat to Mil Spec Specs,
Billet Gas Key Hardened to USGI Specifications
17-4 H900 Stainless steel Firing pin
Grade 8 Hardened Fasteners
Gas Key Staked Per Mil-Spec
Tool Steel Extractor