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The Geissele SD-3G is the flat-bow sibling to the legendary Super 3 Gun (S3G), and it was engineered around one goal: getting rounds downrange fast without sacrificing control. It carries a shortened pull length paired with a snappy reset, giving you a hybrid feel that sits somewhere between a single-stage and a two-stage trigger. That blend traces back to Geissele's Super Select-Fire combat trigger, so you're getting match-grade behavior on top of a design proven under serious use.
The flat trigger bow is the headline change here, and it does more than look good. Patterned after the flat face of a 1911 trigger, it gives your finger better leverage, which lowers the perceived pull weight and puts the pressure right where you want it. You also get cleaner tactile feedback, so you can feel exactly where the reset lives and get back on target quicker. On a busy close-course stage where every split second counts, that feel adds up fast.
The SD-3G ships with two springs so you can tune it to your setup. The gold spring lands you around the heavier end of the range, while swapping to the black spring drops you to a lighter, crisper break for competition work. It's a non-adjustable trigger otherwise, but that two-spring option covers most preferences without fuss.
This is a full-power steel trigger with a black oxide finish, machined to Mil-Spec dimensions and using standard Mil-Spec pins. It fits the AR-15 and AR-10 family, though it's a standard-configuration group rather than a self-contained drop-in cassette, so the hammer, trigger, and disconnector go in and pin up inside your lower. Most folks knock the install out in about ten minutes with a little patience, or your gunsmith can handle it in a few. Just note it's a light, fast, competition-focused trigger and not intended for duty or precision bench work.
It's a standard-configuration trigger, not a self-contained drop-in cassette. The trigger, hammer, and disconnector install as separate pieces inside your lower receiver and pin up with Mil-Spec pins. Most people get it done in around ten minutes, and an extra hand helps hold everything in place while you drive the pins.
The SD-3G ships with two springs so you can set the pull to your preference. The gold spring gives you a heavier pull in the roughly 4.5 pound range, while the black spring drops it to a lighter, crisper break around 3.5 pounds. Swapping springs is the only tuning available since the trigger is otherwise non-adjustable.
Yes, it's designed for the AR-15 and AR-10 family and uses standard Mil-Spec pins. It is not compatible with pistol-caliber carbine variants or SIG MPX/MCX platforms, so stick to standard Mil-Spec ARs for the best results.
It's purpose-built for 3-Gun competition where fast target engagement and quick follow-up shots matter most. Geissele specifically does not recommend it for duty use, bench rest, or shooting tight groups because of its very short, light pull and reset. If you want an all-around or duty trigger, a different Geissele model would suit you better.
| UPC | 854014005076 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 05-166 |
| Color | AR14/AR10 |
| Length | 5.5500 |
| Model | |
| Product Type | Trigger |
| Style | Semi-Auto |
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