I don’t really give a shit about blemish and cosmetics. The guns I’ve built on Aero Receivers are fine. Aero was OEM’ing receivers for a bunch of other companies long before they were known in their own right.
My issue with Aero is the 3rd party import small parts and sloppy assembly of their complete guns and reviver assemblies. I’ve seen too many issues with them.
If buying complete assemblies I’d want BCM, Sionics or SOLGW - blem would be fine.
If you are patient Geissele has some great deals on blems during their Black Friday sakes.