I came upon this idea when my wife was cleaning up in her class room one day. A very easy to use loader that works with MK1 and MK2 Ruger pistols. I believe that it would work on MK3 but I don't have one to test it on. What's better is that you can buy 10 of these clips for a dollar at dollar tree. It seems that these clips were made for the Ruger magazines as they have a grove just in the right place. My best friend has been using one for about a year. They do wear out and lose some clamping ability , but hey 10 for a buck.