ISMI Plunger Tube Spring – Premium

The ISMI Plunger Tube Spring gives your 1911 strong and steady detent pressure. It stops the slide stop from lifting too early. It also creates a crisp, positive click when you use the thumb safety. Because of this, your pistol feels consistent and easy to control during practice, duty use, or competition.

ISMI uses premium silicone chrome alloy to build each spring. This alloy lasts longer than old music wire and holds its shape through heavy use. It also resists fatigue, so the spring stays stable and reliable.

ISMI strengthens each spring through a detailed process. The company heat treats the metal to create even strength. It shot peens the surface to boost toughness. It then stress relieves the spring to keep the pressure consistent. These steps work together and help the spring deliver long service life.

ISMI also follows the same high standards it uses for springs made for U.S. government machine guns. These guns run at extreme cycling speeds, so the springs must perform under stress. The company’s founder also brings knowledge from Indy car racing research, which adds more engineering power to the design.

Because of all this, the ISMI plunger tube spring offers dependable performance and a clean, predictable detent feel.

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 grind, weld, or alter the product. For more information, visit www.P65Warnings.ca.gov.