The Mother Jones lower.
Since 2011, part of the popular online forum Reddit has grown into an active marketplace for assault rifles, high-capacity magazines, and other powerful firearms, according to an investigation by Mother Jones. In the last six months alone there have been more than 1,000 listings posted by more than 400 Redditors on the GunsForSale subreddit, one of thousands of niche communities on the sprawling discussion site. Not only has Reddit allowed a gun market to thrive, it has also literally put its stamp on it: Gun purchases brokered through the site have included nearly 100 AR-15s engraved with Reddit's alien logo, which was used on the assault rifles with explicit permission from the company—while it was owned by media giant Condé Nast—according to email correspondence obtained by Mother Jones.
I went and read the whole stupid article. All their "investigation" turns up is that some people did some legal stuff, most of which involved buying firearms through federally licensed dealers. Then there were some apparently legal, off-books transactions. Naturally, these are called, "exploiting a loop-hole."