Ruger is recalling the new Mark IV .22 lr pistol manufactured prior to June 1st, 2017.
The problem the pistol has is
the potential to discharge unintentionally if the safety is not utilized correctly. In particular, if the trigger is pulled while the safety lever is midway between the "safe" and "fire" positions (that is, the safety is not fully engaged or fully disengaged), then the pistol may not fire when the trigger is pulled. However, if the trigger is released and the safety lever is then moved from the mid position to the "fire" position, the pistol may fire at that time.
The affected pistols are
models bearing serial numbers beginning with "401" (2017 models) or "WBR" (2016 models).
You can read more from their website linked above.