Hi - I just got my NRA Ruger Mini 14 and absolutely love it. I want to get a sling for it, however, it only has the Ruger sling swivel on the front hand guard. There is only a sling swivel post on the rear stock. Does it matter what sling swivel I buy? Will any sling swivel work on the NRA Ruger Mini 14 swivel post on the rear of the stock? Thanks so much for any help you can provide.