The 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's combat-proven two-stage trigger. The SD-E is a flat bow version of the Super Semi-Automatic Enhanced (SSA-E), which features a classic M4 style curved trigger. SPECS Type: 2 Stage 1st Stage Weight Range: 2.0 - 2.5 lbs. 2nd Stage Weight Range: 0.9 - 1.3 lbs. Total Pull Weight Range: 2.9 - 3.8 lbs. Adjustable: No Trigger Bow Type: Flat Pin Size: Mil-spec Mfg: Geissele Automatics Llc