I have never installed sling swivels on a gun, but have bought many shotguns with swivels already installed and have slings on all of them. My shotguns with swivels are a field grade mag ten Ithaca, a Husquvarna Model 51, a 32" DHE Parker, a Sauer drilling, a Remington 870 boat gun, and probably a couple of more I can't think of. I use them all and wouldn't think of going through the expense of trying to hide them.