Introducing our precision engineered complete Mainspring assembly, meticulously crafted for the Ruger MKII and MKIII pistols. This assembly is a testament to superior craftsmanship, utilizing advanced wire EDM-cutting and CNC-machining techniques to ensure unparalleled accuracy and reliability. Unlike the standard Ruger factory MKIII mainspring, our design omits the lock feature, offering a streamlined and efficient performance tailored for enthusiasts who prioritize seamless operation. Elevate your firearm's functionality with this expertly designed mainspring assembly, where precision meets performance. Manufactured in the USA