Ruger 90285 4K30 Scope Ring Silver 30mm Medium
http://www.tandktactical.com/shop/736676902859-ruger-90285-4k30-scope-ring-silver-30mm-medium-7884
http://www.tandktactical.com/web/image/product.template/7884/image_1920?unique=8388fe4
Designed to fit a scope with a 30mm scope tube diameter and a 42 MM objective diameter.
