In case you haven’t seen the notice, Ruger is recalling their Mark IV pistols to make a fix in the .22’s safety system. Ruger says that no one has been injured to their knowledge by this issue, but the company is taking no chances.
If you own a Mark IV, Ruger will cover the shipping costs. All Ruger wants is for owners to send the lowers back to the factory (which can be sent via regular U.S. Mail) and they will turn them around within a week. For your troubles, Ruger will throw in an extra magazine, making this a pretty good deal.