Making it right in my mind, is not simply accepting back the turd that you knowingly sent out. Either someone at Brownells made a large purchase of 2nds from Aero, and decided on their own to label them as they see fit... or I simply got receivers that were already returned prior, by a previous ''unhappy customer that was fully satisfied in the end by our unconditional money back guarantee''.... at which point the receivers they returned are simply put right back into inventory, and sent to me after I purchase them 'on sale'.
These receivers had been on sale for way too long for me to be getting a serial spread like that. All of which adds up to ''guaranteed shenanigans'' on behalf of Brownells, and ''possibly shenanigans, but highly unlikely'' on behalf of Aero.