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

Enhance the performance and reliability of your 1911 pistol with the Evolution Gun Works ISMI 1911 Mainspring (Hammer) 17 lb. Designed specifically for competition and precision shooting, this premium hammer spring delivers consistent energy while promoting a smoother trigger pull for improved accuracy and control.

Key Features

• Chrome silicon construction – Manufactured from high-grade silicone chrome alloy for superior strength and longevity compared to traditional music wire.
• Heat treated, shot peened, and stress relieved – Advanced processing minimizes spring set and ensures consistent performance over thousands of cycles.
• Aerospace-grade engineering – Built to exacting specifications for maximum durability, corrosion resistance, and reliable ignition in 1911 and 2011 platforms.
• 17 lb rating – Lighter tension ideal for competition use, reducing trigger pull weight while maintaining dependable hammer strike.

Benefits for Shooters

Upgrading to the ISMI 17 lb mainspring addresses common pain points like inconsistent ignition or heavy trigger feel. The lighter rating helps achieve a crisper, more predictable trigger response, making it a favorite among competitive shooters. Its robust material and treatment process provide exceptional cycle life, often exceeding 100,000 compressions, reducing the need for frequent replacements.

Specifications

• Weight: 17 lb
• Material: Chrome silicon alloy
• Compatibility: 1911 and 2011 style pistols (full size and commander models)
• Dimensions: Approximately 5.748″ length x 3.268″ width x 0.039″ height
• Finish: Corrosion-resistant design for extended service life

Why Choose the ISMI 17 lb Mainspring?

Unlike standard springs, this ISMI model offers a precise balance of reduced effort and reliable function. Whether you’re fine-tuning a match pistol or maintaining a duty firearm, the 17 lb option provides the performance edge serious shooters demand without compromising safety or consistency.

Upgrade your 1911’s ignition system today with this precision-engineered mainspring from Evolution Gun Works and experience enhanced trigger feel and dependable operation.