I'm not aware of rings being produced for the 228. Not many people are re ringing them any more. But there are usually some NOS ones available on eBay. It you are not able to hone the cylinders yourself, you need to have the cylinders honed to break the glaze. Otherwise the new rings will never seat. I have an expensive hone, but an in expensive Lisle 23500 hone will work. They are less than $30. A machine shop will be very expensive and probably try to talk you into a lot of work you really don't need.