Obviously it has to do with people listing gun stuff for ridiculous prices, but I'm out of the loop here.
Side note: Almost all used gun prices online are overpriced. Also most gun-shows: "$50 for a buffer and buffer tube", highway robbery.
Reminds me of this: https://www.youtube.com/watch?v=OsmsDafYyaM
The Copper Rule was to make fun of dumb fucks who tried to sell shit that was wildly overpriced (and/or weeb shit) on Armslist. When Reddit laid down the banhammer on sales of guns and parts (and temporarily banned GunDeals in the process) the Armslist links had to go.
Thanks!