Geissele Automatics SD556
The Geissele Super Duty rifle is a semi-automatic AR-15 chambered in 5.56 NATO with a cold hammer-forged barrel and Geissele's proprietary components throughout. Featuring the SSA-E X trigger, Super 42 braided wire buffer spring, REBCG, and SMR MK16 handguard, this rifle represents Geissele's no-compromise approach to the AR-15 platform.

Specifications
| UPC | 817953028803 |
|---|---|
| Brand | Geissele Automatics |
| Model | SD556 |
| Caliber | 223 Remington |
| Mfg Part Number | 08-187ODG |
| Mfg Id | GEISLE |
| Barrel Length | 14.5" Pinned (16" OAL) in |
| Capacity | N/A |
Geissele Automatics is a leading manufacturer of high-performance firearm components, specializing in precision triggers, upper receivers, and handguards. Known for exceptional craftsmanship and battlefield reliability, Geissele products are trusted by military professionals, law enforcement, and civilian shooters who demand duty-grade quality.
Founded in 2004 by Bill Geissele, the company first gained recognition for its SSA (Super Semi-Automatic) trigger. Originally built for competitive shooters, Geissele's reputation quickly spread to the military sector, where its components were adopted for special operations. Today, Geissele Automatics LLC remains at the forefront of AR-platform innovation and manufacturing.
Top Geissel…
Founded in 2004 by Bill Geissele, the company first gained recognition for its SSA (Super Semi-Automatic) trigger. Originally built for competitive shooters, Geissele's reputation quickly spread to the military sector, where its components were adopted for special operations. Today, Geissele Automatics LLC remains at the forefront of AR-platform innovation and manufacturing.
Top Geissel…
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