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 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.
Key Features
- Two-stage design — prep the take-up, break with certainty
- Crisp, predictable second stage — the pull quality Geissele is known for
- Full-power ignition springs — dependable primer strikes
- Non-adjustable, nothing to drift — set at the factory for the life of the rifle
Compatibility & Fitment
Drop-in fit for AR-15/M4 pattern lower receivers with standard Mil-Spec .154 in trigger and hammer pins. Large-pin and some proprietary receivers are not compatible — confirm your pin size before ordering. A straightforward armorer-level install; always verify function and safety checks after fitting.
Technical 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 |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
Will the SSA fit my AR-15?
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 on hand.
What does SSA stand for, and what is it set up for?
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.
Is it adjustable, and how does it differ from the SSA-E?
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 SSA-E is the enhanced version with a lighter, crisper break aimed at precision work. Pick the SSA for service-style use and the SSA-E for deliberate marksmanship.
Anything else needed to install it?
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.
