New, by popular demand, all our AR-15 Toolcraft BCG's will feature Mil-Spec Carpenter No. 158 Bolts. And, as always, all our Toolcraft carriers are are plated by UCT Coatings in Florida, with the EXO coating. UCT is the originator of EXO coating, a patented, high-performance nickel boron coating.
Bolt: Carpenter No. 158 Alloy Steel, Shot Peened
Extractor: Shot Peened Hardened D2 tool steel
Gas rings (3): Milspec
Coating: Nickel Boron Plated
Heavy Duty M16 design
8620 steel, plated
Gas key: hardened billet 4140 machined, plated
Gas Key Screws,: Grade 8 properly staked (heavy strike). Screws on faceted model may or may not be plated.
Nickel Boron Plated (UCT Coatings in Florida)
8620 steel Nickel Boron Plated
mil-spec firing pin made from centerless ground 8740 steel, hard chrome coated