I ordered the sling swivel stud (4 of them) from combattactical.com. They came with out the nut. When I contacted them they (Mirelle) said they don't have nuts anymore and that they would be ordering the nuts separately for me and send them ASAP. It's been 2 months and they still havent sent me any nuts. They did suggest that I go out and buy them from some other store and that they would reinburse me. I am just responding to let others know that the link you posted is misleading. Combattactical does not have any nuts with this particular swivel stud.
Update: 10/23/2012 Combattactical sent me the studs with out the nuts again. Contacted them they said they would send the nuts.
Update: 11/02/2012 Combattactical sent the nuts, but they are the wrong size. Contacted them again, I wonder what they will send this time?