The Geissele SD-E trigger, the Super Dynamic Enhanced (Geissele part no. 05-167), is a finely tuned two-stage AR-15 and AR-10 trigger with an exclusive flat trigger bow. It provides enhanced trigger control and accuracy while keeping the robustness and reliability of Geissele’s combat-proven two-stage design. It is the flat bow version of the Super Semi-Automatic Enhanced, which has the classic M4 curved bow. Geissele Automatics lists the same light first and second stage weights for both, so the bow shape is the real choice between them.

Key Specifications

• The trigger is two-stage, with a defined take-up before the break.
• First-stage pull weight is 2.0 to 2.5 lb, a light take-up.
• Second-stage pull weight is 0.9 to 1.3 lb, for a clean break.
• Total pull weight is 2.9 to 3.8 lb, and Geissele notes that all weights are approximate.
• The trigger bow is flat, the exclusive bow that sets the SD-E apart from the curved-bow SSA-E.
• The trigger is non-adjustable, so there is nothing to set after installation.
• It uses mil-spec pin sizes, so it works with standard mil-spec pins.
• The platform is AR15/AR10, designed for mil-spec AR15/M4 carbine rifles.
• Geissele lists enhanced trigger control and accuracy as the goal of this enhanced model.

Frequently Asked Questions

What is the difference between the SD-E and the SSA-E? The SD-E is the flat bow version of the SSA-E, which has a classic M4 style curved bow. Pull weights are listed the same for both.

Does the SD-E fit a Sig MPX/MCX or a pistol caliber carbine AR? No. Geissele designs its AR15 triggers for mil-spec AR15/M4 carbine rifles and says they are not compatible with the Sig MPX/MCX or with pistol caliber carbine AR15/M4 variants, and that using them in those platforms voids the warranty. Geissele also notes that Colt 901 rifle owners need different pins for the wider receiver.

Can I adjust the pull weight? No. Geissele lists the SD-E as non-adjustable, at 2.0 to 2.5 lb in the first stage and 0.9 to 1.3 lb in the second.

Buy the Geissele SD-E Super Dynamic Enhanced Two-Stage AR Trigger, Flat Bow

If you like a flat bow and a two-stage pull, the SD-E delivers both without any adjustment to fuss over. See more AR triggers in our catalog and order from our Lubbock, Texas gun shop for fast, insured shipping.