https://midstatefirearms.com/product/10-pack-wholesale-nitride-m16-ar15-full-auto-bolt-carrier-group/

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Complete Black Nitride / Melonite Bolt Carrier Group. Smooth & Protective Nitride coating. 

Pack of 10

5.56/223 & 300 Blackout BCG 

M16 Carrier-8620
Bolt-9310
MPI & HPT Tested 
Shot Peened
Upgraded Extractor Spring with o-ring

 

Made in the USA by a quality manufacturer.