Geissele Automatics 05167 SD-E Two-Stage Flat Trigger with 2.90-3.80 lbs Draw Weight & for AR-15/AR-10The Geissele Super Dynamic Enhanced (SD E) Trigger featuring an exclusive flat trigger bow, is a finely tuned two stage trigger providing enhanced trigger control and weapon accuracy while maintaining the robustness and reliability of Geissele combat proven two stage trigger. The SD E is ideal foruse in precision Squad Designated Marksman type rifles where weapon accuracy and reliability are critical.