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.
Why shooters choose the SSA
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Two-stage design — prep the take-up, break with certainty
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Crisp, predictable second stage — the pull quality Geissele is known for
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Full-power ignition springs — dependable primer strikes
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Non-adjustable, nothing to drift — set at the factory for the life of the rifle
What the SSA fits
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.
Specifications
| 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 — in stock at Xtreme Tactical Gun Parts with free tracked UK delivery in 7–10 days.
Explore more: all Rifle Triggers, AR-15 Parts & Accessories or browse all Geissele Automatics.
