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APRH100019 has a Mil-Spec phosphate coating APRH100615 has a Black Nitride Finish - advanced lower friction coating that minimizes the need for lubricants and cleaning this is from https://www.aeroprecisionusa.com/

Hi Josh and welcome. The only difference is the metal coating. The superior coating for best durability with reduced friction and therefore less heat is the APRH100615 with the Black Nitride Finish. Cheers, stay safe and enjoy!