Do these need some type of coating/parkerizing? They are listed as In the White but I'm no metallurgist and can not find any info on its type of metal(SAE 9310). Thanks.
I've gotten both the complete BCG with the Enhanced bolt and just the bolt. They're both the same, i.e. no coating added. I don't think JP would sell the BCG/bolt combo without a coating on the bolt if they felt it was needed.