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.
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.
Key Features
- Fast rolling break and reset — built for competition splits
- Flat trigger bow — consistent placement at maximum speed
- Hybrid single-stage feel — light without feeling fragile
- Geissele metallurgy and quality control — race speed, Geissele reliability
Compatibility & Fitment
Drop-in fit for AR-15/M4 pattern lower receivers with Mil-Spec .154 in trigger and hammer pins. 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.
Technical 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 |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
What lowers is the SD-3G compatible with?
It drops into AR-15/M4 pattern lower receivers that use mil-spec trigger pins. Confirm your pin size before ordering, as large-pin lowers need a different trigger. If your receiver is an unusual make, send us the details and we'll check compatibility.
What is the SD-3G set up for?
As the name suggests it is built for 3-gun and similar competition: a competition trigger on a flat bow, intended for fast, repeated shots where a short, positive break matters more than a long deliberate press. The flat shoe gives a consistent finger position at speed. It is not the choice for a general-purpose service carbine.
How is it different from the S3G?
The S3G is a single-stage hybrid with a very short, fast reset, while the SD-3G brings the Super Dynamic flat bow to the competition format. Which you prefer usually comes down to whether you like taking up a stage before the break or want everything to happen in one motion. Both are aimed at the same kind of shooting.
Is anything else needed to run it?
Nothing beyond your existing trigger and hammer pins, assuming they are serviceable. It is supplied in one configuration, so there is no shoe or finish choice to make.
