Factory new Ruger Mark III .22LR blued pistol magazine.  Catalog No. 90231 / Part No. M10MKIII NOTE: Ruger .22LR pistol magazines look very similar but are not interchangeable.  Make sure you get the right one for your model pistol.  In addition to this Mark II magazine, we also stock replacement magazines for the following Ruger .22 pistols: 1. Ruger Mark II 2. Ruger 22/45 3. Ruger 22/45 Mark III