Sig Sauer SIG 556 SWAT 5.56 NATO, 16 in, Short-Stroke Piston, Quad-Rail, Tan, Magpul MOE Stock
This U.S.-made Sig Sauer SIG 556 SWAT stands out with its short-stroke gas piston system, adjustable gas regulator, and a full-length T-marked Picatinny top rail paired with an aluminum quad-rail handguard. It features a 16-inch threaded barrel with a birdcage-style flash suppressor, AR-pattern magazine compatibility, and a uniform tan finish across metal and polymer components. The receiver is marked "SIG 556 5.56 NATO SIGARMS INC., EXETER, NH, USA," and the bore is in excellent condition.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The rifle shows markings from prior handling and use. The exterior has an aftermarket, DIY rattle-can paint job. Please refer to the photos for a detailed view.
What’s Included
- Owner's manual
- Knight's Armament Co. polymer rail cover (installed)
- Magpul MOE carbine stock (installed)
- 1x 30-round Hexmag HX-AR Series 2 polymer magazine
The SIG 556 SWAT configuration delivers a robust feature set built around a semi-automatic, short-stroke gas piston with a rotating bolt. An adjustable gas regulator at the gas block supports reliable operation with varying ammunition and conditions.
A full-length, T-marked Picatinny top rail and an aluminum quad-rail handguard provide extensive mounting real estate. No sights are installed, and a Knight's Armament Co. rail cover is fitted to the handguard.
The 16-inch barrel is threaded and capped with a birdcage-style flash suppressor. The receiver is alloy construction with a uniform tan/light-earth finish matched to the polymer furniture.
Ergonomics and compatibility are AR-centric, including AR-pattern magazine use and a stated 30+1 capacity. A Magpul MOE six-position carbine stock in tan is installed, offering a 13.5-inch length of pull. Controls include a manual safety selector.
Markings confirm U.S. manufacture by SIGARMS (SIG Sauer) in Exeter, New Hampshire: "SIG 556 5.56 NATO SIGARMS INC., EXETER, NH, USA." Chambering is 5.56mm NATO, with the bore described as bright, clean, and sharply rifled.