IOTA TRIAD SCOPE RINGS $170 iotaoutdoors.com
These are scope rings for perfectionists. Each pair of rings comes with interchangeable cross-slot inserts in three different sizes (six total) for a better fit on Picatinny rails. Before mounting the rings, you try the narrow, regular, and wide inserts in the rail’s slots. Like Cinderella’s slipper, whichever fits best is the one you attach to the ring. It’s a clever system that eliminates extra slop when mounting an optic.