The Volquartsen Ruger MK II/MK III mainspring is a precision replacement component built for shooters who want to restore or upgrade the trigger function of their Ruger Mark-series pistol. Volquartsen has engineered this mainspring assembly using wire EDM-cutting and CNC-machining processes to ensure consistent geometry and reliable performance. Whether you're doing a complete trigger job or replacing a worn factory spring, this mainspring is a straightforward way to refresh the mechanics of your MK II or MK III.

This mainspring does not include the lock feature present on factory Ruger MK III mainsprings. That difference matters if you're accustomed to the factory design; verify your current setup before ordering to ensure it fits your workflow and preferences. The black finish matches standard Ruger aesthetic and won't introduce incompatible materials into your pistol's action.

Ruger Mark pistols are popular among recreational shooters, competition shooters, and trainers for their reliability and aftermarket support. A quality mainspring keeps that trigger response consistent and predictable—critical whether you're running drills at the range, competing in rimfire matches, or simply maintaining a pistol you've owned for years.

The Volquartsen Ruger MK II/MK III mainspring is a precision replacement component built for shooters who want to restore or upgrade the trigger function of their Ruger Mark-series pistol. Volquartsen has engineered this mainspring assembly using wire EDM-cutting and CNC-machining processes to ensure consistent geometry and reliable performance. Whether you're doing a complete trigger job or replacing a worn factory spring, this mainspring is a straightforward way to refresh the mechanics of your MK II or MK III.

This mainspring does not include the lock feature present on factory Ruger MK III mainsprings. That difference matters if you're accustomed to the factory design; verify your current setup before ordering to ensure it fits your workflow and preferences. The black finish matches standard Ruger aesthetic and won't introduce incompatible materials into your pistol's action.

Ruger Mark pistols are popular among recreational shooters, competition shooters, and trainers for their reliability and aftermarket support. A quality mainspring keeps that trigger response consistent and predictable—critical whether you're running drills at the range, competing in rimfire matches, or simply maintaining a pistol you've owned for years.