I bought a few blem Anderson lowers for really cheap, $35 or so from Fatboy Tactical. It was so cheap I could not refuse even for the sweep the floor builds excuse I gave myself. Aside from the generic ding on one, a strange discoloration on the hard anodizing on another one and the other one having a strange texture finish, they all have been assembled and function fine.
IMO most people will not mention or admit they have these in a certain build because it is well known for being wallet friendly. From my experience, most will brag about their Spikes this, BCM that, original Colt this with rare prancing unicorn roll mark. Much like how chics gotta rock the name brand purse/shoes/or whatever else. I'm a drag racer by heart, IMO just run what ya brung.