Geissele Super 3 Gun (S3G) Trigger - High-Performance AR-15 Competition Trigger

The Geissele Super 3 Gun (S3G) trigger is a single-stage AR-15 competition trigger built for shooters who demand speed and precision on the range. If you're running an AR platform in 3-gun matches or high-volume training sessions, this trigger delivers the short, crisp break and fast reset that separate competitive shooters from the pack. It drops into any standard AR-15 lower receiver using existing hammer and trigger pins—no gunsmithing required.

Born from Geissele's combat-proven Super Select Fire platform used by elite military units, the S3G distills that pedigree into a semi-auto-only competition tool. You get a light, predictable trigger pull—as low as 3-1/4 lbs—that makes rapid follow-up shots fast and repeatable. The quick reset means you can stay on target between rounds without breaking your grip or sight picture.

This is purpose-built for the competition line, where every millisecond and every round count. The S3G excels in 3-gun, speed shooting, and similar disciplines where you're stacking fast, accurate shots. It's not designed for duty carry, bench-rest precision work, or roles where a duty-grade trigger is needed—know the tool and use it accordingly.

Key Features

• Single-stage design with short, light trigger pull
• Trigger pull weight as low as 3-1/4 lbs
• Fast reset for quick follow-up shots
• Fits standard AR-15 lower receivers
• Uses existing hammer and trigger pins
• Semi-auto-only; not for duty use or bench-rest applications

Specifications

Frequently Asked Questions

Will the Geissele S3G fit my AR-15 lower?

Yes. The S3G is designed for standard AR-15 lower receivers and uses existing hammer and trigger pins, so installation is straightforward with no modifications needed.

Is this trigger good for long-range or bench-rest accuracy work?

No. The S3G is optimized for competition shooting where speed is the priority. It's not recommended for bench-rest or accuracy-focused applications.

Can I use this trigger for duty or home defense?

No. The S3G is explicitly not recommended for duty use. It's built for semi-auto competition shooting only.

What makes the reset so fast?

The S3G is derived from Geissele's combat-proven Super Select Fire platform used by special operations units. That proven design, adapted for semi-auto competition, delivers both a quick reset and a light pull for rapid, accurate follow-up shots.