I've used a toothbrush on firearms, but never flossed one before... First time for everything, and I feel very proud of doing my part for gun hygiene. Everyone should brush and floss their gun regularly.
Not that it was very dirty like other people here have described, just loose dust, and a little carbon. Almost like it was used (definitely fired), maintained and cleaned well, then put away after a range session and left to collect dust. There are some very shiny bits and wear surfaces, maybe even polished(?) I'll try to post another couple pics when I get a chance later. I've also not seen a used mag where the lower lip of the plastic extension (pinkie rest) did not have a nick or two.
Not bad overall for a purchase under the effect of Corona Virus Cabin Fever (chuckle). I'm wondering what to check or inspect, but maybe that's for another thread.