Not sure if I understand your question. The bare aluminum of an Anodized receiver? If you are talking about the trigger group pocket after finishing, then I use nothing but a light coat of oil rubbed in.

Thanks the response scorpiusb To clarify, though it looks like you figured it out, I was in fact referring to an anodized 80% lower after completing. 20 years in Aerospace Quality, and I just cannot live with the bare aluminum. Never thought about the non serialized aspect, but you are probably right. Haven't looked into that far yet. But the Alumihyde in Flat Black should do the trick just fine. Thanks again!!