MicroBest BCG 556 Chrome C158 MPI+Sprinco+Oring+ PHOS Extract

SHIPS TO YOU WED 7/24/24

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
Hard chrome finish

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

Cam Pin:
4340 mil spec
Hard chrome finish

Firing Pin:
Mil spec firing pin made from centerless ground 8740 steel, hard chrome coated

Write a review