Geissele Automatics

Geissele Super Dynamic Enhanced SD-E Trigger - AR-15 Flat Bow

Name: Geissele Super Dynamic Enhanced SD-E Trigger - AR-15 Flat Bow
Brand: Geissele Automatics
SKU: 05-167
Price: 279.99 GBP
Availability: InStock

£279.99

VAT included.

£5 Tracked Delivery · 7–10 Business Days

Estimated delivery: Tue 8 Sep – Fri 11 Sep

Stock is imported from the USA to us, then shipped to you from the UK — we cover all duties and import charges, so there is nothing to pay on delivery.

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Product Overview

The Geissele Super Dynamic Enhanced (SD-E) is a flat-bow two-stage trigger for AR-15 and M4 pattern rifles, fitting Mil-Spec lower receivers that use .154 in trigger and hammer pins.

The lightest-breaking flat-bow trigger in Geissele's two-stage line — the SD-E is precision shooting distilled.

The Geissele Super Dynamic Enhanced (SD-E, 05-167) marries the SSA-E's crisp, light second stage with the flat trigger bow of the Super Dynamic line. The flat shoe's geometry adds leverage and puts your finger in the same place every shot; the enhanced internals reward that consistency with a break often compared to snapping glass. Together they make the SD-E a strong pick for precision AR-15 builds whose owners still want two-stage safety margin.

Geissele's machining and finishing keep the pull consistent across thousands of rounds, and full-power springs preserve dependable ignition. Non-adjustable — there is nothing to set up.

Why shooters choose the SD-E

Enhanced light second stage — a very crisp, clean break
Flat trigger bow — repeatable finger position, added leverage
Two-stage precision with safety margin — prep, then commit
Full-power ignition springs — dependable primer strikes

What the SD-E fits

Drop-in fit for AR-15/M4 pattern lower receivers with Mil-Spec .154 in trigger and hammer pins. That includes UK straight-pull AR-15 target builds, where the lighter enhanced second stage is exactly what deliberate, aimed shooting asks for. Large-pin receivers are not compatible — confirm your pin size before ordering. Installation is armourer-level work, with function checks to follow before live fire.

Specifications

Platform	AR-15 / M4
Fits	Mil-Spec lower receivers with .154 in trigger and hammer pins
Type	Two-stage trigger, flat bow
Made in	USA
Brand	Geissele Automatics
MPN	05-167

Precision deserves this break. Order the SD-E 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.

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

Platform	AR-15 / M4
Fits	Mil-Spec lower receivers with .154 in trigger and hammer pins
Type	Two-stage trigger, flat bow
Made in	USA
Brand	Geissele Automatics
MPN	05-167
SKU / MPN	05-167
UPC / Barcode	854014005151

Shop Related Categories

Shop AR-15 Parts & Accessories View category

Shop AR-15 Triggers View category

Shop Geissele Automatics View category

Shop Rifle Triggers View category

Related Buying Guides

Not sure which option is right for your build? These guides break it down.

Buying Guide AR-15 Trigger Guide: Single-Stage vs Two-Stage, Pull Weight & Fit

Buying Guide Geissele vs Timney vs TriggerTech vs Radian: Trigger Brands Compared

View all buying guides →

Product Questions

Will the SD-E drop into my AR-15 lower?

It is designed as a drop-in for AR-15/M4 pattern lowers with mil-spec trigger pins. Large-pin receivers and some non-standard lowers will not take it, so check your pin size before ordering. If in doubt, measure the pin holes or ask us with your receiver details.

What is the SD-E aimed at?

The SD-E is the Super Dynamic Enhanced: a two-stage trigger on a flat bow, set up as the lighter, more precision-oriented member of the Super Dynamic family. The flat shoe puts your finger lower on the bow, which changes the leverage and makes the break feel more consistent to many shooters. It suits marksmanship and general precision work more than close-range speed shooting.

How does it compare with the SD-C?

Both are flat-bow two-stage triggers, but the SD-C is set up as the combat-weight option with a heavier, more duty-oriented pull, while the SD-E is the enhanced, lighter-feeling one for precision. If the rifle is a working carbine, the SD-C is the safer choice; if it is a target or DMR-style build, the SD-E is the natural pick.

Do I need any other parts to fit it?

No, it assembles into the lower with standard trigger and hammer pins in the usual positions, so no extra hardware is required if your existing pins are in good condition. Anti-walk pins are optional rather than necessary. You can see how it sits against the rest of the range in our AR-15 triggers collection.

What about delivery and returns?

We send triggers from the United Kingdom with £5 tracked UK delivery in 7–10 business days and email tracking when the parcel leaves. If the trigger turns out to be the wrong fit, see our returns policy or contact us and we'll help sort it.