Transform the performance and feel of your compact 1911 with the ISMI 18 lb. flat wire recoil spring. Specifically designed for the shorter slide of an Officer's Model, this spring provides a noticeably smoother recoil impulse and a more positive return-to-battery, making it the single best reliability upgrade for your everyday carry pistol.

The ISMI Advantage: Taming the Compact 1911

The shorter cycle of an Officer's Model can be harsh. ISMI's flat wire recoil springs offer a distinct performance advantage over the traditional round wire springs found in most compact 1911s.

• Smoother, More Controllable Recoil: The flat wire design compresses more linearly, which smooths out the "snappy" recoil impulse common in short-barreled 1911s. This helps you keep your sights on target for faster, more accurate follow-up shots.
• Exceptional Durability: Crafted from certified aerospace-spec chrome silicon alloy steel, these flat wire springs are rated for an incredible service life, resisting wear and taking a "set" far longer than any music wire spring.
• Made in the USA: Proudly manufactured in the United States by ISMI, the top choice for high-performance firearm springs.

Application & Tuning Guide

An 18 lb. recoil spring is a popular and versatile choice for the 3.5" Officer's Model 1911, offering a great balance of performance and reliability.

• Standard & +P Ammunition: This spring weight is ideal for reliably cycling a wide range of standard pressure 230gr ball and powerful +P hollow point defensive ammunition.
• Enhanced Reliability: Provides a strong, positive return-to-battery, which is critical for reliable feeding in a self-defense firearm where slide velocity is higher due to the lighter slide.
• The Perfect All-Around Upgrade: If you want to improve the feel and ensure the function of your Officer's Model without getting into complex tuning, this 18 lb. flat wire spring is the perfect drop-in enhancement.

Technical Specifications