TANDEMKROSS(R) Magazine Follower Buttons are designed for compatible Ruger Mark Series and 22/45 magazines. These replacement magazine components provide an upgraded follower-button configuration and feature brass construction. This package includes two follower buttons for compatible Ruger rimfire pistol magazines.Key Features Designed for compatible Ruger Mark Series and 22/45 magazines Replacement magazine follower button design Brass construction Designed for compatible .22 LR magazines Includes two magazine follower buttonsTANDEMKROSS(R) manufactures firearm components and accessories with a focus on rimfire firearm applications. The company develops purpose-built products with an emphasis on functional design durable materials and platform compatibility. TANDEMKROSS products are manufactured with attention to fit practical performance and consistent operation.