https://midstatefirearms.com/product/titanium-nitride-tin-m16-ar15-mpi-bolt-carrier-group-5-56223/

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omplete TiN (Titanium Nitride) gold colored Bolt Carrier Group. Smooth & Protective TiN treated.  5.56/223 & 300 Blackout BCG. Super smooth finish and easy to clean.

M16 Carrier-8620
Bolt-9310
MPI & HPT Tested 
Shot Peened
Upgraded Extractor Spring with o-ring
 
The finish is very hard and smooth, but some lubrication is still recommended since it’s a moving part.  

Made in the USA by a quality manufacturer.