MicroBest BCG 556 Phosphate C158 MPI +Sprinco +Oring

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Bolt Carrier:
Heavy Duty M16 design
8620 steel heat treated
Gas Key Material - 4140 heat treated
Grade 8 Gas Key Screws, Staked
Chrome lined gas key and carrier interior
Manganese Phosphate per mil spec

Bolt Subassembly:
Bolt: 158 Carpenter Steel, shot peened per mil spec
MPI tested
Ejector Pin: S7 mil spec
Extractor: 4340 mil spec
Extractor Pin: S7 mil spec
Extractior Spring: Sprinco 27001 Extractor Spring, 5-coil 
O-Ring: Mil Spec
Gas rings (3): Mil spec
Manganese Phosphate per mil spec

Cam Pin:
4340 mil spec
Manganese Phosphate per mil spec

Firing Pin:
Mil spec centerless ground 8740 steel, hard chrome coated

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