3.5lb Single-stage trigger system Allows you shoot more accurately with less effort Ultra-smooth break with a crisp, clean release Fits small pin size (.154) Quick reset and low overtravel for enhanced speed Interior parts are S7 tool steel with heavy-hit hardening then black nitride finished for enhanced strength and corrosion resistance. Lightened trigger pull (3.5-lb. pull weight). Lightened hammer. Drop safety feature. Self-contained design makes it easy and quick to install with no fine-tuning needed.