Toolcraft's awesome 308 caliber BCG in the UCT Coatings EXO finish, aka the "Fail Zero" finish. The bolts on this latch batch are slightly more white and matte than the fail zero carrier. DPMS pattern, with forward assist serrations. These carriers have the popular faceted sides.

Bolt:
MPI Inspected
9310 Alloy Steel
Hardened Steel Extractor
D2 tool steel extractor
Black Extractor Insert
Mil-Spec O-Ring
Milspec Gas rings (3)
Nickel Boron Plated
The carrier may or may not have the words "Made in USA" engraved on the left side. The quality and construction are the same.

Bolt Carrier:
8620 steel
Heavy Duty Full Cut Design
Grade 8 Gas Key Screws, Staked
Nickel Boron Plated
Gas Key Material - 4140
Chrome lined gas key and carrier interior

Cam Pin:
8620 steel Nickel Boron Plated

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