The pics have showed up for me since yesterday afternoon.
My initial thought was "not legal".
Then I started looking in the shooter's handbook. It is specifically mentioned as illegal regarding shotgun shells, but I'm not seeing anything that would outlaw cartridge loops leaning out like that. There are some situations where they say "if you have to ask, it is not legal" but I don't know if it applies to this.
But I can tell you that some folks will assume it is illegal and give you a hard time about it. If I saw it, I would give you a hard time about it, even if I knew it was legal. (I really hate overly "gamer" type of leather).