I would like to make my shotgun -- Remington 870 black synthetic stock -- ready for sling carry. This would involve adding a rear stock sling stud to the black sythetic stock. Can anyone provide any advice on how this is done and how well this works as an after market installation?

Additionally, I know there are sling studs that can be installed into the tube magazine cap, but I don't know where I can find those either. Any advice?