Sig Sauer SIG 556 SWAT 5.56 NATO, 16 in, Long-Stroke Piston, Quad-Rail, Folding Stock, US-Made, Discontinued
This SIG Sauer SIG 556 SWAT is a U.S.-market, semi-automatic carbine derived from the Swiss 55X system and manufactured in Exeter, NH per the receiver rollmark. It features a long-stroke gas piston system, a 16 inch barrel with flash hider, an aluminum quad-rail handguard, and a side-folding skeletonized polymer stock. This discontinued model accepts STANAG-pattern magazines and comes equipped with an installed ACOG-style red-dot sight (non-Trijicon replica) and a rail-mounted weapon light that replicates the Streamlight TLR-1.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: This firearm is in solid shape with some scratches and blemishes present. The bore is clean and shiny.
What's Included
- Factory hard case
- SIG Sauer SIG 556 manual
- Sling
- ACOG-style red-dot sight (non-Trijicon replica), installed
- Rail-mounted weapon light, installed (replica of Streamlight TLR-1)
- 2x 30-round magazines (one polymer windowed STANAG; one metal STANAG)
The SIG 556 SWAT pairs the proven long-stroke gas piston system with a 16 inch barrel and flash hider, delivering the 5.56 NATO performance buyers expect from the U.S.-made evolution of the Swiss 55X lineage. The receiver is marked Exeter, NH, and the rifle is a discontinued model, which adds interest for those seeking this specific configuration.
SWAT trim features an aluminum quad-rail handguard that provides multiple accessory mounting points, plus a side-folding, skeletonized polymer stock with a 13.0 inch length of pull. A flip-up front sight is integrated on the gas block for a low-profile aiming reference.
This example accepts STANAG-pattern magazines and includes two 30-round magazines: one polymer windowed STANAG and one metal STANAG. The rifle also includes a scope mount and top rail area to support optics as configured.
An ACOG-style red-dot sight made to resemble a Trijicon ACOG is installed, along with a rail-mounted weapon light that replicates the Streamlight TLR-1. The bore is clean and shiny with good, well-defined rifling, aligning with the rifle’s solid overall condition.