Toolcraft BCG 5.56 Black Nitride C158 MPI Bolt

Bolt Carrier:
8620 steel
Heavy Duty M16 design
Grade 8 Gas Key Screws, Staked
Gas Key Material: 4140
Finish: Salt Bath Nitride²

Bolt Subassembly:
Bolt: 158 Carpenter Steel per Government Spec
MPI Inspected¹
Extractor: Shot Peened Hardened D2 tool steel 
O-Ring: Mil-Spec 
Gas rings (3): Mil-Spec 
Finish: Salt Bath Nitride²

Cam Pin:
8620 steel
Finish: Salt Bath Nitride²

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

Notes:
1.  All Toolcraft bolts are MPI inspected, but not necessarily marked MPI.  WCArmory requests MPI marked bolts but Toolcraft can not guarantee that all MPI inspected bolts will be MPI marked.  Email WCArmory for this disclaimer from the Toolcraft Operations Manager.
2.  All BCG's are ordered complete with bolt and accessories direct from Toolcraft
3.  WCArmory has been selling Toolcraft BCG's since 2009.

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