Few scope bases designed to fit the factory-drilled holes in Ruger 10/22 receivers mount low enough to allow the use of the guns’ original barrel-mounted iron sights when an optic is not ...

For example, a Picatinny allows you to mount a Scout type scope farther down the barrel. That's not an option with a Weaver mount. Ruger rings Ruger has the simplest, most intuitive scope mounts.