Evolution Gun Works ISMI 1911 Mainspring (Hammer) 17 lb - 10640

Enhance the performance and reliability of your 1911 or 2011 pistol with the Evolution Gun Works ISMI 1911 Mainspring (Hammer) 17 lb. Engineered for shooters who demand consistent ignition and a refined trigger experience, this premium hammer spring delivers the perfect balance of power and smoothness in a compact, high-performance package.

Premium Material Construction

Crafted from advanced silicone chrome alloy rather than traditional music wire, the ISMI mainspring offers superior durability and resistance to fatigue. Each spring undergoes rigorous heat treatment and shot peening processes, ensuring it withstands the demands of high-volume shooting while maintaining precise tension over time.

Key Features and Benefits

• Optimized 17 lb Rating: Provides reliable hammer strike energy for consistent primer ignition across a wide range of ammunition while contributing to a smoother, lighter trigger pull compared to heavier factory springs.
• Aerospace-Grade Design: Built to exacting specifications for maximum consistency, corrosion resistance, and longevity in demanding environments.
• Broad Compatibility: Fits standard 1911 Series 70 and 80 models as well as 2011 platforms, making it a versatile upgrade for both full-size Government and Commander configurations.
• Exceptional Endurance: Proven to exceed 100,000 compression cycles without loss of performance, reducing the need for frequent replacements.

Why Choose the ISMI 17 lb Mainspring?

Traditional mainsprings can lead to inconsistent ignition or heavy trigger feels that affect accuracy and enjoyment. This 17 lb option addresses those pain points by delivering strong, predictable hammer energy in a lighter package that enhances overall shootability without compromising safety or function. Whether you’re refining a competition pistol or upgrading a duty firearm, this spring helps achieve reliable function with a more responsive trigger system.

Technical Specifications

• Weight rating: 17 lb
• Material: Silicone chrome alloy
• Finish: Heat treated and shot peened
• Compatibility: 1911 (Series 70 & 80), 2011 pistols
• Physical dimensions: Approximately 5.748 in length, 3.268 in width, 0.039 in height

Upgrade your 1911 platform with this precision-engineered component from Evolution Gun Works and experience the difference in consistency and performance.