Geissele Automatics

Geissele Super Dynamic 3-Gun SD-3G Trigger - AR-15 Flat Bow (05-166)

Name: Geissele Super Dynamic 3-Gun SD-3G Trigger - AR-15 Flat Bow (05-166)
Brand: Geissele Automatics
SKU: 05-166
Price: 299.99 GBP
Availability: InStock

£299.99

Tax included where applicable.

In stock

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Delivery Information

Orders are dispatched from the United Kingdom with tracked delivery. You will receive tracking details by email once your order ships.

Returns & Refunds

Please see our Returns & Refunds policy for full details on returns and exchanges.

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SKU: 05-166UPC: 854014005076

Product Overview

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 lightning single-stage-feel hybrid internals with the flat Super Dynamic trigger bow. The result is a short, light, rolling break with an extremely 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's competition triggers are built with the same metallurgy and QC as their duty line, so running fast does not mean running fragile. If your scores hinge on hosing paper at speed and hammering steel in the same stage, this is the trigger built for the job.

Why shooters choose the SD-3G

Ultra-fast rolling break & reset — built for competition splits
Flat trigger bow — consistent placement at maximum speed
Hybrid single-stage feel — light without feeling fragile
Duty-grade metallurgy and QC — race speed, Geissele reliability
Made in the USA

Fit & installation

Fits AR15/M4-pattern lowers with Mil-Spec (.154 in) pins. Install at the bench, verify function and safety, then go find a shot timer.

Specifications

Model: 05-166
Platform: AR-15/M4
Type: Competition trigger
Trigger shoe: Flat bow
Made in: USA

Built for the clock. Order the SD-3G today — in stock at Xtreme Tactical Gun Parts with free UK delivery.

Explore more: all Rifle Triggers, AR-15 Parts & Accessories or browse all Geissele Automatics.

Compatibility & Fitment

Drop-in fit for AR-15/M4 pattern lower receivers with mil-spec trigger pins. Confirm pin size before ordering.

Please confirm platform, interface and fitment requirements before ordering.

Technical Specifications

SKU / MPN	05-166
UPC / Barcode	854014005076
Brand	Geissele Automatics

Product 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 duty 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.

Anything else needed to run it, and how do I choose between brands?

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. If you are cross-shopping, our comparison of AR trigger brands sets out how the main makers differ in feel and adjustment.

How does delivery and returns work?

Orders are dispatched from the United Kingdom with free tracked UK delivery, and you'll get tracking by email when it ships. If a part turns out to be the wrong fit, see our returns policy or contact us and we'll help sort it.