ISMI 1911 Hammer Spring / Mainspring – Premium (17 Pounds)
Reliable, Consistent Hammer Energy for Your 1911
The ISMI 1911 Hammer Spring / Mainspring – 17 Pounds delivers strong, consistent hammer energy while maintaining smooth, predictable operation. As a result, your 1911 feels stable, responsive, and dependable with every trigger press. Whether you shoot at the range, compete seriously, or rely on your pistol for tactical use, this mainspring ensures consistent performance shot after shot.
Premium Silicone Chrome Alloy Construction
ISMI manufactures each mainspring from high-grade silicone chrome alloy rather than traditional music wire. Because this advanced alloy resists fatigue and deformation, it maintains its shape even under heavy, repeated use. Consequently, the spring delivers steady pressure over time and provides long-lasting reliability. Therefore, you can trust your 1911 to perform consistently, even through extended shooting sessions.
Advanced Multi-Stage Production Process
To further enhance durability and performance, ISMI strengthens every mainspring using a proven, multi-stage production process. First, heat treating creates uniform strength throughout the alloy. Next, shot peening increases surface toughness and improves resistance to wear. Finally, stress relieving stabilizes the spring and preserves consistent tension over the long term.
Together, these steps ensure the mainspring withstands frequent cycling while maintaining reliable hammer energy under demanding conditions.
Engineered for Extreme Performance
ISMI designs its springs to meet the same high standards required for U.S. government‑contracted machine guns. Because these platforms cycle at extreme speeds, the springs must perform reliably under constant stress. In addition, the founder’s background in Indy car racing research contributes advanced engineering principles and precision design to every spring.
As a result, each ISMI mainspring delivers exceptional strength, consistency, and durability that exceed typical firearm spring requirements.
Enhanced Pistol Performance and Control
By installing an ISMI Hammer Spring / Mainspring, you improve hammer response and overall system consistency. Consequently, trigger feel becomes more predictable, and ignition reliability remains stable. Moreover, pairing this mainspring with other premium ISMI small parts creates a balanced and dependable 1911 upgrade.
Key Benefits
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Delivers long-lasting, stable tension
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Provides smooth, predictable hammer operation
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Built from durable, fatigue-resistant silicone chrome alloy
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Engineered for extreme performance and heavy use
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Proven design influenced by government and motorsport applications
Summary
Overall, the ISMI 1911 Hammer Spring / Mainspring – 17 Pounds ensures consistent power, smooth operation, and long-term reliability. By combining premium materials, advanced manufacturing processes, and high-performance engineering, this mainspring keeps your 1911 operating with confidence and control. Therefore, whether for precision shooting, competition, or tactical reliability, it delivers dependable performance every time you pull the trigger.
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