This is the Magpul QDM QD Sling Swivel.

If you’ve been looking for a heavy-duty upgrade to your old-school push-button QD sling swivel, look no further!

Thanks to the QPQ salt bath nitride finish, this steel sling swivel provides superior durability and corrosion resistance. Best of all, with dual side release tabs, you’ll never have to worry about accidental releases any longer! 

Order a couple of these QD sling swivels today and upgrade all of your slings!