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The Geissele Super Dynamic Enhanced, or SD-E, is what happens when a combat-tested trigger gets tuned for precision. It shares the same guts as Geissele's legendary SSA-E, the difference being the exclusive flat trigger bow instead of the classic curved M4 shoe. That flat face gives your finger a consistent contact point no matter where it lands, and it sits slightly forward of a standard AR trigger for a little extra reach and leverage. The result is a two-stage feel that a lot of folks compare to a glass rod breaking: a smooth take-up followed by a clean, predictable second stage with next to no creep.
This is a two-stage design with a total pull weight in the 2.9 to 3.8 lb range, generally settling right around 3.5 lbs out of the box. The first stage runs about 2.3 lbs of smooth take-up, and the second stage breaks at roughly 1.2 lbs. It is non-adjustable, which is part of the appeal for a lot of people. You get a match-grade break without fussing over set screws, and that consistency is exactly why it earned a home in Squad Designated Marksman and SPR-style builds.
The internals are cut from heavy-duty tool steel with engagement surfaces machined by wire EDM for that slick, repeatable feel. The lighter hammer paired with a full-power spring also trims lock time down considerably compared to a stock AR hammer, which helps when you are trying to hold a small group. The hammer and trigger pins are hardened chrome moly, so they resist wear and won't chew up your lower the way softer aftermarket pins can.
The SD-E drops into most mil-spec AR-15 and AR-10 pattern lowers using standard .154-inch small trigger pins. It fits semi-auto 5.56, .223, and many .308 AR-platform rifles. Keep in mind it is not built for Sig MPX/MCX guns or pistol-caliber AR variants, and Colt 901 owners will need the wider-receiver pin set. If your lower takes a standard trigger, this one goes right in.
They are essentially the same trigger internally, with the same weights and combat-proven components. The SD-E uses Geissele's exclusive flat trigger bow, while the SSA-E has a classic curved M4-style shoe. If you prefer the consistent contact and slightly longer reach of a flat trigger, the SD-E is the one to grab.
The SD-E is a non-adjustable two-stage with a total pull weight in the 2.9 to 3.8 lb range, usually right around 3.5 lbs. That breaks down to about 2.3 lbs of first-stage take-up and roughly 1.2 lbs on the second stage. Since it is a fixed design, you get that tuned match feel without dealing with set screws.
It drops into most mil-spec AR-15 and AR-10 pattern lowers that use standard .154-inch small trigger pins. It works with semi-auto 5.56, .223, and many .308 AR-style rifles. It is not designed for Sig MPX/MCX platforms or pistol-caliber carbine variants, and Colt 901 owners will need a wider pin set.
Not at all if you have basic AR knowledge. It goes in like any standard trigger group, and the kit comes with a tube of grease and illustrated instructions. Many folks recommend a light coat of that included grease on the engagement surfaces during install for the smoothest operation.
| UPC | 854014005151 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 05-167 |
| Color | AR14/AR10 |
| Length | 5.5500 |
| Model | |
| Product Type | Trigger |
| Style | Non-Adjustable |
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