The 102102 Apex Ultimate Safety Plunger by Apex Tactical Specialties is specifically engineered for Glock pistols. These pistols include those chambered in 9mm, .40 S&W, .357Sig, and 10mm. Notably, this product is designed to enhance the smoothness of the trigger take-up, providing an improved experience over the original factory component.In addition to its performance enhancement, the Ultimate Safety Plunger ensures the utmost safety. This is particularly evident as it sustains proper safety function even when the timing undergoes adjustments due to the incorporation of aftermarket trigger systems.