I've used the Quake Hush Stalker sling swivels for years and recently ordered another set from Midway for the Mossberg.

Arrived yesterday and I was pleasantly surprised to find that they are a new QD design that features a large sprung tab for easy quarter turn operation even with gloved hands - certainly the most user friendly silent swivels I've come across.

Strange thing is that they are not even featured on the Quake website - all they show is a QD design that you have to unscrew the pin to operate.