The Geissele Super 3-Gun (S3G) is a hybrid single-stage competition trigger for AR-15 and M4 pattern rifles, fitting Mil-Spec lower receivers that use .154 in trigger and hammer pins.
The single-stage that made 3-Gun shooters switch — Geissele's S3G is speed engineered, not just lightened.
The Geissele Super 3-Gun (S3G, 05-152) is a hybrid single-stage competition trigger: a short, smooth rolling break with almost no perceptible take-up, paired with a reset so short and positive that fast pairs feel like one motion. Geissele designed it for the demands of 3-Gun — close-range work and precise singles at distance — and the pull handles both without changing character.
Because it is a Geissele, the speed comes from geometry and machining rather than weakened springs: ignition stays full-power reliable and the internals hold their feel across seasons of competition. A curved bow keeps the traditional feel for shooters who prefer it.
Why shooters choose the S3G
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Hybrid single-stage design — rolling break, minimal take-up
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Exceptionally short reset — pairs and strings blur together
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Full-power ignition — speed without light-strike gambles
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Competition internals — consistent through high round counts
What the S3G 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 it is the short, light break rather than the fast reset that does the work, so weigh that against Geissele's two-stage models before ordering. Large-pin receivers are not compatible — confirm your pin size first. Fit at the bench and run full function and safety checks before live fire.
Specifications
| Platform |
AR-15 / M4 |
| Fits |
Mil-Spec lower receivers with .154 in trigger and hammer pins |
| Type |
Single-stage hybrid competition trigger, curved bow |
| Made in |
USA |
| Brand |
Geissele Automatics |
| MPN |
05-152 |
Speed you can trust. Order the S3G 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.
