(for selling a mag pouch)Odds are you violated an Ebay policy unrelated to firearms.
Anything that is remotely connected to something they believe of as an "assault rifle" or a real machine gun is verboten. That includes soft goods such as pouches, parts roll, etc.
I advertised a canvas tool roll (with no parts/tools, just the canvas) that was for supporting a military machine gun. It got booted off ebay. So then I just put the nomenclature for which weapon it was for. It got booted off again. I contacted ebay support and they recommended I put it up again, but just say "empty tool roll" without identifying what rifle it was for. Yeah, like anyone would buy that...
There were some other things I put up with similar results. I got tired of it and haven't sold much on there since.