STI Mainspring Housing 25 LPI Blue

Precision-Machined STI Mainspring Housing with 25 LPI Checkering

Upgrade your STI 1911 with the EGW 25 LPI Blue STI Mainspring Housing and immediately improve control, balance, and durability. EGW machines this housing from solid bar-stock steel and then sandblasts and hot-blues it for a clean, professional finish. As a result, you get a rugged component that looks great and performs even better.

Improved Grip and Better Control

25 LPI Precision Checkering

The 25 lines-per-inch checkering adds consistent traction where it matters most. Therefore, your grip stays secure during recoil, rapid fire, and reloads. At the same time, the texture remains comfortable for extended shooting sessions.

Balanced Weight Distribution

In addition, the steel construction adds weight to the rear of the pistol. Consequently, the gun feels more balanced in hand and tracks more smoothly shot to shot.

Built for Long-Term Performance

Solid Bar-Stock Steel Construction

EGW machines each mainspring housing from a single piece of steel. Because of this, it resists cracking, deformation, and wear far better than plastic or cast alternatives.

Durable Blued Finish

After machining, EGW sandblasts and hot-blues the housing. As a result, the finish provides corrosion resistance while giving your pistol a classic, refined appearance.

Fitment and Installation

Designed for STI 1911 Pistols

This mainspring housing fits STI 1911 full-size and Commander-length frames. Therefore, installation remains straightforward and precise.

Installation Notes

Pins and springs are not included. However, you can easily reuse the parts from your original mainspring housing or install new components if preferred.

Why Choose an EGW Mainspring Housing?

By replacing a factory plastic housing with this EGW steel upgrade, you gain better grip traction, improved balance, and increased durability. Moreover, EGW’s tight machining tolerances ensure a reliable fit and consistent performance. In short, this upgrade enhances both the feel and function of your STI 1911.

Important Notes

• Does NOT fit: Tisas B9R

• California Proposition 65 Warning: This product may contain trace amounts of elements known to the State of California to cause cancer or reproductive harm. Do not alter the product by grinding or welding. For more information, visit www.P65Warnings.ca.gov.