Toolcraft's 308 caliber BCG in Nickel Boron. DPMS pattern, with forward assist serrations. 100% Made in USA and includes Lifetime Warranty from Toolcraft. If ever a problem, simply call Toolcraft and they will take excellent care of you with their no questions asked Lifetime Warranty. Does not work with 6.5 Creedmoor or DPMS G2.

Bolt Assembly:
Bolt: 9310 Alloy Steel, Shot Peened
MPI Inspected
Extractor: Shot Peened Hardened D2 tool steel 
Mil-Spec O-Ring
Milspec Gas rings (3)
Nickel Boron

Bolt Carrier:
Heavy Duty full auto design
8620 steel
​Gas Key: hardened billet 4140 machined, Chrome lined gas key
Gas Key Screws,: Grade 8 properly staked (heavy strike)
Nickel Boron

Cam Pin:
8620 steel
Nickel Boron

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