The TANDEMKROSS Maximus plus 1 follower is an essential enhancement for the Ruger Mark series, tailored for competitive rimfire shooting. This drop-in upgrade is compatible with Ruger Mark IV, Mark III, Mark II and 22/45 models, transforming your firearm into a competition-ready tool. The Maximus plus 1 follower enables the loading of 11-round in a standard 10-round magazine, which is advantageous for rimfire competitions permitting an 11-round start. Constructed from robust Zytel and featuring a bright red color, it enhances safety by clearly indicating when the magazine is empty. Installation is straightforward, requiring no special tools. The Maximus plus 1 follower is available in two-packs and is compatible with both the factory magazine base pad and the TANDEMKROSS MarkPRO magazine bumper for Ruger Mark IV and Mark IV 22/45. Additionally, it functions seamlessly with extended magazine bumpers for Ruger Mark III and Mark III 22/45. Optimize your competitive edge by increasing your magazine capacity with the TANDEMKROSS Maximus plus 1 follower for the Ruger Mark series. The capacity of your Ruger MK and MK 22/45 magazines by adding one additional round The red indicator is displayed when the magazine is empty, enhancing safety by providing a clear visual alert to prevent operational errors Constructed using zytel material, this product ensures exceptional durability and longevity, making it ideal for demanding applications