Mil-Spec Cam Pin Genuine AR-15/M16 parts made to military specifications by a government contractor.
Nitride finished Rockwell Hardness is 80-85 where QPQ nitride Increases exterior hardness To above chrome
Specs So 3x harder than regular finished cam pins.
These often replaced parts should be replaced or inspected every 5000 rounds
Nitride Cam pin life is 10,000+ rounds 2x that of Phosphate
Part Number: 4400