Ruger 90318 4K30HM Scope Ring Silver 30mm Medium
https://www.tandktactical.com/shop/736676903184-ruger-90318-4k30hm-scope-ring-silver-30mm-medium-13552
https://www.tandktactical.com/web/image/product.template/13552/image_1920?unique=f749830
Designed to fit a scope with a 30mm scope tube diameter and a 42 MM objective diameter.
