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This is the same Mil-spec BCG that Spikes Tactical sells, except it is coated with the most durable finish on the market, nickel boron. Smoother and harder than hard chrome, it allows this bolt carrier group to be run almost lube free for thousands of rounds. It is being adapted by the US military and many government agencies as a standard for their BCGs. 

Specifications and Features:
High pressure tested
Magnetic particle inspected
M-16 profile
158 Carpenter steel bolt
8620 tool steel carrier
Nickel boron coating inside and out
Gas key properly staked
Bolt is shot peened and HPT/MPI
M-16 profile (will NOT make an AR-15 fully automatic)