Elevate your shooting experience with the Apex Tactical Stainless Steel SD 9/40 Spring Kit. Crafted from durable stainless steel this precision-engineered kit enhances your firearm's performance by delivering a smoother trigger pull and improved reset making it ideal for duty and carry use. Whether used on its own or paired with the Apex SD Polymer Action Enhancement Trigger this kit includes a trigger spring striker block spring and SD striker spring ensuring reliable and consistent operation. Upgrade your firearm with components designed for longevity and superior functionality.