https://midstatefirearms.com/product/blem-titanium-nitride-tin-m16-ar15-mpi-bcg-5-56223/

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This is a blemished item, aka ‘blem’. May have ugly spots in the finish. May be dirty or scuffed.  The blem could be anything. These are expected to function fine. We’re not able to describe exactly what the blem is, as they vary.  All sales final on this item, no warranties expressed or implied.
As with any bcg, check your head space when putting a new bolt and barrel together.  

Complete 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.