I am getting a MK II Competition and it is drilled and tapped. Yours may not be.
There are at least 2 choices: Ruger mounts and base, available on the Ruger website, or Weaver mounts and base. The Weaver base is available from Ruger or Brownell's, with Weaver compatible rings available from many sources. I plan to use the Weaver base on mine with Warne QD mounts.