Geissele Super 3-Gun Trigger Mil-Spec Pin S3G AR-15
Geissele Automatics
$250.00
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Geissele Automatics
Geissele Super 3-Gun Trigger Mil-Spec Pin S3G AR-15
The Geissele Super 3 Gun (S3G) Mil-Spec Pin trigger is an elite competition-grade drop-in upgrade engineered for shooters who demand lightning-fast target transitions and rapid follow-up shots on dynamic 3-gun and action shooting courses.
- Single-stage design delivers a crisp, consistent pull with zero take-up
- Ultra-short reset maximizes split times between rapid follow-up shots
- Total pull weight of 3.25 lbs. or 4.0 lbs. depending on spring selection
- Mil-spec pin dimensions ensure broad compatibility with standard AR-15 lowers
- Precision-machined components built to Geissele's legendary quality standards
- Optimized for close-course competition where speed and accuracy intersect
Who This Is For
The S3G is purpose-built for competitive 3-gun, USPSA, and action shooting athletes who need a fast, responsive trigger for dynamic stage work and high-round-count matches. It is not intended for duty carry, bench rest precision shooting, or long-range accuracy work — it thrives in the hands of competitors who live and die by split times and target-to-target transitions.
Specifications
| Brand | Geissele Automatics |
|---|---|
| Model | Super 3 Gun (S3G) |
| Trigger Type | Single Stage |
| Pull Weight | 3.25 lbs. or 4.0 lbs. (spring dependent) |
| Pin Size | Mil-Spec (.154") |
| Platform | AR-15 / M16 (Mil-Spec Lower) |
| Reset | Short / Competition |
| Intended Use | 3-Gun & Action Shooting Competition |
| Country of Origin | USA |
Frequently Asked Questions
Is the Geissele S3G suitable for everyday carry or home defense?
No. Geissele explicitly does not recommend the S3G for duty use or self-defense applications. Its extremely light and short pull is optimized for competition speed, which may not meet the safety standards expected in a defensive carry role. For duty or defensive use, consider a Geissele trigger with a heavier pull weight and more deliberate reset.
Will the S3G fit my standard AR-15 lower receiver?
Yes — the S3G uses standard mil-spec .154" trigger and hammer pins, making it compatible with the vast majority of mil-spec AR-15 and M16 lower receivers. If your lower uses .170" large-pin dimensions (common in some DPMS-pattern lowers), you will need the large-pin version of this trigger instead.
What is the difference between the 3.25 lb. and 4.0 lb. pull weight options?
The S3G's pull weight is determined by the hammer spring included or selected at installation. The lighter 3.25 lb. pull offers the fastest possible reset and trigger feel for seasoned competitors, while the 4.0 lb. option provides a marginally heavier pull that some shooters prefer for added confidence during rapid-fire strings. Both are competition-legal in most 3-gun and action shooting divisions.
