Sig Sauer SIG 556 5.56 NATO Semi-Auto Rifle, 16 in Barrel, Long-Stroke Gas Piston, Magpul MOE Stock
This US-made Sig Sauer SIG 556 pairs a proven long-stroke gas piston system with a 16-inch barrel and an adjustable gas regulator at the gas block. It features a continuous Picatinny top rail, a right-side folding reciprocating charging handle, and a STANAG/AR-15 pattern magazine well. This example is configured with a Magpul MOE collapsible stock and an A.R.M.S. #40L low-profile folding rear sight, with flip-up front sight at the gas block.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: Some finish wear is visible. Handling wear is present throughout. The bore is clean and in great shape.
What’s Included
- Two-point sling with bungee sections (installed)
- Magpul MOE carbine collapsible stock (installed)
- A.R.M.S. #40L low-profile folding rear sight (installed)
- 1x 30-round USGI-pattern aluminum STANAG magazine
The SIG 556 operates via a long-stroke gas piston and includes an adjustable gas regulator at the gas block, offering reliable cycling across a range of conditions. Its 16-inch barrel is fitted with a birdcage flash hider, and the threaded muzzle supports the installed device.
The rifle combines a stamped steel upper with an aluminum-alloy lower for durability and balanced weight. Controls include a two-position safety selector and a left-side bolt catch/release. The right-side folding reciprocating charging handle provides positive manipulation while maintaining the platform’s 55x-style manual of arms.
Sighting equipment consists of a flip-up front sight at the gas block and a low-profile A.R.M.S. #40L folding rear sight marked "40L" and "7.6 MOA." A continuous Picatinny top rail runs the length of the receiver for mounting sighting solutions to suit the user’s needs.
Furniture includes a two-piece ribbed polymer handguard and a ribbed polymer 55x-pattern pistol grip marked SIGARMS. The installed Magpul MOE collapsible stock provides an adjustable length of pull of approximately 11–14 inches. The rifle accepts standard STANAG/AR-15 magazines and is marked "SIG 556" and "SIG 5.56 NATO, SIG SAUER INC, EXETER, NH, USA."