The Geissele Super Dynamic 3-Gun (SD-3G) is a flat-bow competition trigger for AR-15 and M4 pattern rifles, fitting Mil-Spec lower receivers that use .154 in trigger and hammer pins.
Competition speed behind a flat bow — the SD-3G is Geissele's race trigger for shooters who count in tenths.
The Geissele Super Dynamic 3-Gun (SD-3G, 05-166) pairs the S3G's hybrid internals with the flat Super Dynamic trigger bow. The result is a short, light, rolling break with a very fast reset — engineered for the split-times of 3-Gun and action shooting — delivered through a shoe that keeps your finger placement identical on every stage, every target, every transition.
Geissele builds its competition triggers with the same metallurgy and quality control as the rest of its line, so running fast does not mean running fragile. If your scores hinge on speed and precision inside the same stage, this is the trigger built for the job.
Why shooters choose the SD-3G
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Fast rolling break and reset — built for competition splits
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Flat trigger bow — consistent placement at maximum speed
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Hybrid single-stage feel — light without feeling fragile
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Geissele metallurgy and quality control — race speed, Geissele reliability
What the SD-3G fits
Drop-in fit for AR-15/M4 pattern lower receivers with Mil-Spec .154 in trigger and hammer pins, which includes UK straight-pull AR-15 lowers. On a straight pull the flat bow and short, light break are what you feel; the very fast reset matters less than it does on a self-loader, so consider Geissele's two-stage models too. Large-pin receivers are not compatible — confirm your pin size first. Install at the bench, verify function and safety, then go find a shot timer.
Specifications
| Platform |
AR-15 / M4 |
| Fits |
Mil-Spec lower receivers with .154 in trigger and hammer pins |
| Type |
Competition trigger, flat bow |
| Made in |
USA |
| Brand |
Geissele Automatics |
| MPN |
05-166 |
Built for the clock. Order the SD-3G today — in stock at Xtreme Tactical Gun Parts with £5 tracked UK delivery in 7–10 business days.
Explore more: all Rifle Triggers, AR-15 Parts & Accessories or browse all Geissele Automatics.
