Flat River Arms Nickel Boron Bolt Carrier Group 5.56 Bolt Carrier Group (BCG)
$125.00
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Flat River Arms Nickel Boron Bolt Carrier Group 5.56 Bolt Carrier Group (BCG)
Flat River Arms produced by Toolcraft Nickel Boron Bolt Carrier Group 5.56 BCG.
Nickel Boron Auto 556 w/C158 bolt carrier group.
Toolcraft uses UCT Coatings in Florida, with the EXO coating. UCT is the originator of EXO coating, a patented, high-performance nickel boron coating. The carrier is round, plain (no engraving), and the nickel boron finish is buffed to an extremely impressive shine.
Bolt Subassembly:
Bolt: Carpenter No. 158 Alloy Steel, Shot Peened
MPI Inspected
Extractor: Shot Peened Hardened D2 tool steel
O-Ring: Mil-Spec
Gas rings (3): Milspec
Coating: Nickel Boron Plated
Bolt Carrier:
Heavy Duty M16 design
8620 steel, plated
Gas key: hardened billet 4140 machined, plated
Gas Key Screws,: Grade 8 properly staked (heavy strike), Screws may or may not be plated.
Nickel Boron Plated, High Sheen Buff Polish (UCT Coatings in Florida)
Cam Pin:
8620 steel Nickel Boron Plated (UCT EXO Finish)
Firing Pin:
mil-spec firing pin made from centerless ground 8740 steel, hard chrome coated
