1911 Main Spring

1911 Replacement Mainspring

This United Defense mainspring is a replacement coil spring for the 1911 pistol. In a 1911, the mainspring sits in the mainspring housing at the back of the grip and drives the hammer forward when the trigger releases it. A tired spring can weaken hammer strikes, so a fresh one is a sensible part to keep on hand. It suits owners maintaining their own pistols and builders putting a 1911 together from parts.

Features

• Made For The 1911 Platform — The spring is intended for the 1911 pistol, the single-action design whose layout many modern pistols still follow.
• Hammer Drive Spring — Once compressed, it pushes the hammer forward through the hammer strut, the small rod that links the hammer to the spring.
• Mainspring Housing Fit — It installs inside the mainspring housing, the removable part that forms the back strap of the 1911 grip.
• Tightly Wound Coil — Round wire wound in a close, even pitch gives the spring a compact length and consistent compression.
• Black Finish — The coils carry a uniform black finish, as the photographs show.
• Service Replacement Part — Swapping in a new spring is routine maintenance for a 1911 that has seen heavy use or long storage under tension.
• United Defense Brand — It comes from United Defense, a commercial maker of firearm parts.

Fit And Installation

You reach the mainspring by removing the mainspring housing from the rear of the frame. The spring then comes out with its retaining parts. Because 1911s from different makers can vary, check this part against your pistol before you install it. If you are not comfortable working on the fire control group, have a qualified gunsmith fit it.