Geissele Super Semi-Automatic SSA Trigger - AR-15 Two-Stage
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Drop-in fit for AR-15/M4 pattern lower receivers with mil-spec trigger pins. Confirm pin size before ordering.
Not sure it fits your rifle? Ask us before you order
The Geissele SSA is a two-stage drop-in trigger for AR-15 and M4 pattern rifles, fitting Mil-Spec lower receivers that use .154 in trigger and hammer pins.
The two-stage trigger that changed what shooters expect from an AR-15 — the Geissele SSA is the standard others are measured against.
The Geissele Super Semi-Automatic (SSA, 05-101) is a precision two-stage trigger: a smooth, deliberate first-stage take-up followed by a crisp, predictable second-stage break. That two-stage discipline lets you prep the trigger and commit only when the sights say so, which is why two-stage designs dominate serious marksmanship and precision use. Geissele builds it for hard use, with full-power springs for dependable ignition.
Machining, materials and quality control are where Geissele earned its name: every trigger is built to tolerances that make the pull feel identical on round one and round ten thousand. Non-adjustable by design — nothing to drift, nothing to come loose.
Drop-in fit for AR-15/M4 pattern lower receivers with standard Mil-Spec .154 in trigger and hammer pins. That includes UK straight-pull AR-15 builds, where a clean two-stage break is the single biggest change you can make to how the rifle shoots, and the SSA's heavier, more forgiving weight suits a rifle used in gloves and in poor weather. Large-pin and some proprietary receivers are not compatible — confirm your pin size before ordering. A straightforward armourer-level install; always verify function and safety checks after fitting.
| Platform | AR-15 / M4 |
|---|---|
| Fits | Mil-Spec lower receivers with .154 in trigger and hammer pins |
| Type | Two-stage trigger |
| Made in | USA |
| Brand | Geissele Automatics |
| MPN | 05-101 |
The benchmark two-stage. Order the Geissele SSA today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: all Rifle Triggers, AR-15 Parts & Accessories or browse all Geissele Automatics.
| Platform | AR-15 / M4 |
|---|---|
| Fits | Mil-Spec lower receivers with .154 in trigger and hammer pins |
| Type | Two-stage trigger |
| Made in | USA |
| Brand | Geissele Automatics |
| MPN | 05-101 |
| Category | Trigger |
| Shipping weight | 0.2 kg |
| Barcode | 854014005007 |
£5 tracked UK delivery on every order via Royal Mail Tracked 24. Our products are ordered in from the manufacturer rather than held in UK stock, so please allow 7 to 10 business days (Monday to Friday, excluding bank holidays) from the date of your order for it to reach you. Tracking details are emailed on dispatch. UK delivery only.
You have 30 days from receiving your order to cancel it for any reason, then 14 days to send it back unused and in its original packaging. Faulty, damaged or incorrect items are replaced or refunded and we cover reasonable return postage. Refunds go back to your original payment method within 14 days of receiving the return.
It drops into AR-15/M4 pattern lowers that use mil-spec trigger pins. Large-pin and some proprietary receivers are not compatible, so confirm your pin size before ordering. Measure the pin holes if the lower's specification is not to hand.
SSA is Geissele's Super Semi-Automatic, a two-stage trigger built for hard use. It is set up to be dependable and predictable rather than as light as possible, with a clear first stage and a defined break. That makes it a sensible choice for a rifle that has to work in the cold, in gloves and in the wet.
The SSA is non-adjustable, so what you feel out of the box is what you keep, which suits shooters who would rather not tinker. The <a href="/products/geissele-ssa-e-trigger-ar-15">SSA-E</a> is the enhanced version with a lighter, crisper break aimed at precision work. Pick the SSA for duty-style use and the SSA-E for deliberate marksmanship.
No, it uses standard trigger and hammer pins and needs no shims or springs, though a set of anti-walk pins is a common optional addition. There is a single configuration, so no variant decision to make. If you want to see how it stacks up against other makers, our <a href="/blogs/buying-guides/best-ar-trigger-brands-compared">brand comparison</a> covers the main options.
We dispatch from the United Kingdom with £5 tracked UK delivery in 7–10 business days and email tracking when it ships. If the trigger is the wrong fit for your lower, see our returns policy or <a href="/pages/contact">contact us</a> and we'll help sort it.
7 to 10 business days from the date of your order. Every order is sent Royal Mail Tracked for a flat £5 and you receive tracking details by email when it is dispatched.
Yes. We list only genuine parts and optics from the brands shown, ordered in from the manufacturer for your order.
Compatibility notes on this page come from the manufacturer. If you are unsure, email us with your make and model before ordering and we will check rather than guess.
Yes. Bundle & Save applies automatically in your basket: 5% off when you buy 2 items, 10% off at 3 items and 15% off at 4 or more. It works across the whole range, so you can mix and match, and there is no code to enter.
Yes — you have 30 days from delivery to cancel for any reason, as long as the item is unused and in its original packaging. See our returns policy for the details.
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