I have absolutely given up the trouble and expense of trying to hide the fact that my shotguns originally had swivels. If you have a German shotgun, you aren't hiding anything by plugging holes and welding up swivel bases. I am going out to the goose pit tomorrow morning and, at 70, I would not think of taking a gun without swivels and a sling. In fact, everything I will carry to the field will have a sling or shoulder strap, gun, bag, and whatever.