Ultra Dot 30 Sight Kit has a 4 MOA Red Dot and 30mm Tube!- Build the original Ultra Dot sight into a 30mm Tube and you have the Ultra Dot 30... With a little wider and brighter field of view. A 4 MOA Red Dot with the same toughness and reliability, now on a 30mm Tube. The UD30 Kit includes two 30mm rings for mounting on any Weaver style or Picatinny scope base. A tube extension lets you mount in situations where the rings are further apart. And the screw-on polarizing filter cuts reflections and glare. This sight is excellent for hunting or competition. Mount it on handguns, rifles, shotguns, or muzzleloaders.