Transform the feel of your full-size 1911 with the ISMI 13 lb. flat wire recoil spring. This is a premium, lightweight spring designed for shooters looking to tune their Government model for a noticeably softer recoil impulse with standard velocity or light handloads. The advanced flat wire design provides a uniquely smooth compression feel and an exceptionally long service life, making it a favorite for range and training pistols.

The ISMI Advantage: Flat Wire Technology

ISMI's flat wire recoil springs offer a distinct performance advantage over traditional round wire springs, making them a favorite of custom builders and serious shooters.

• Smoother Recoil Impulse: The flat wire design compresses more linearly than round wire, resulting in a smoother, less "snappy" felt recoil that helps keep your sights on target during rapid fire.
• 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 in nearly every shooting discipline.

Application & Tuning Guide

A 13 lb. recoil spring is lighter than the factory standard (typically 16 lbs.) for a 5" Government model 1911. This makes it a specialized spring for specific applications:

• Light Target Loads: Perfect for tuning your pistol to reliably cycle lighter-than-standard ammunition, such as 185gr or 200gr semi-wadcutters, common in competitive disciplines.
• Reduced Recoil for Training: Pairing this lighter spring with standard velocity 230gr FMJ can produce a softer recoil impulse, making extended range sessions more comfortable.
• Compensated Pistols: An excellent choice for Government models fitted with a compensator, which requires a lighter spring to ensure proper slide function.

Technical Specifications

Important: This recoil spring is designed for use with a .25" guide rod only.

For more technical background and spring selection guidance, read our in‑depth comparison: 1911 Recoil Springs – A Gunsmith’s Comparison of Flat vs. Round Wire.