Genuine Ruger Magazine for Mark IV and Mark III Pistols
The Ruger 90231 is a genuine factory 10-round magazine for compatible Ruger Mark IV and Mark III pistols chambered in .22 LR. It is the right choice for an owner who wants a replacement magazine, additional range magazines, or factory OEM magazines to keep a rimfire pistol running with the fit and feed geometry Ruger intended.
Rimfire pistols can be more magazine-sensitive than many centerfire handguns. Feed angle, follower movement, spring tension, cartridge presentation, and magazine-catch engagement all matter. Starting with a genuine Ruger factory magazine helps avoid introducing an aftermarket variable into a pistol that may otherwise run well.
Important Mark-Series Compatibility Note
This magazine is for compatible Ruger Mark IV and Mark III pistols. It is not the correct magazine for the original Mark I, Mark II, or 22/45-style pistols. Ruger Mark-series names are similar enough that it is easy to order the wrong magazine if the exact model is not confirmed first.
Before ordering, verify the pistol model, grip frame style, magazine release arrangement, and current magazine design. If your pistol is a Mark I, Mark II, Mark IV 22/45, Mark III 22/45, or another 22/45 variant, select the correct magazine for that specific pistol instead of this Mark IV / Mark III magazine.
Why Add Extra Mark IV or Mark III Magazines?
A Ruger Mark-series pistol is most useful when it is easy to shoot often. Extra magazines let the owner spend more time practicing sight alignment, trigger control, reload habits, and general marksmanship instead of stopping after every single magazine to reload.
Spare factory magazines are also useful for keeping range sessions organized. A shooter can keep several magazines loaded at the bench, dedicate certain magazines to practice or match use, and replace a damaged or worn magazine without taking the pistol out of service.
Built for Practical Range Use
The 90231 magazine uses a 10-round .22 LR capacity, E-nickel steel body, black base plate, and black follower. The side loading assist button makes loading rimfire cartridges easier during longer sessions, especially when filling multiple magazines before a drill, class, or informal plinking session.
As with all rimfire firearms, ammunition selection still matters. Different .22 LR loads can vary in feeding, ignition, extraction, and accuracy. Test your preferred ammunition with each magazine before relying on the combination for a match, field use, or a long range day.
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