ISMI 1911 Firing Pin Spring – Premium

The ISMI 1911 Firing Pin Spring – Premium gives your pistol steady and reliable firing pin control. It holds the firing pin in the correct position during cycling and adds an extra layer of internal safety. Because of this, your 1911 feels consistent and confident every time you use it.

ISMI builds each spring from high‑grade silicone chrome alloy. This alloy lasts longer than old-style music wire and resists fatigue. It also holds its shape through heavy use, so the spring delivers stable tension and long service life.

ISMI strengthens every spring through a clear and proven process. The team heat treats the alloy for strong, even structure. They shot peen the surface to increase toughness. They stress relieve the metal to keep the tension steady over time. These steps work together and create a durable, dependable spring.

Each spring undergoes a multi-stage production process to maximize reliability:

• Heat treated for uniform strength

• Shot peened for improved surface toughness

• Stress relieved to maintain consistent tension over time

ISMI follows the same high standards used for springs made for U.S. government‑contracted machine guns. These systems cycle at extreme speeds, so the springs must meet very demanding requirements. The founder’s experience in Indy car racing research adds even more precision and performance to every design.

Because of this, the ISMI 1911 Firing Pin Spring offers strong tension, long-lasting reliability, and excellent material quality.

California Proposition 65 Warning

This product may contain trace amounts of lead or other elements known to the State of California to cause cancer or reproductive harm. Do not alter the product by welding, grinding, or similar processes. For more information, visit www.P65Warnings.ca.gov