SIG Sauer SIG556 Classic 5.56 NATO Semi-Auto Rifle, 16 in Barrel, Exeter NH, Diopter Sights, Folding Stock, 40-Rd Mag
The SIG Sauer SIG556 Classic blends the proven 55X-series long-stroke gas piston system with AR-15/STANAG magazine compatibility in a U.S.-made package. This Exeter, NH production rifle features a 16-inch crowned barrel, an integral Picatinny top rail, and Swiss-style furniture highlighted by a triangular side-folding stock. Iron sights include a front sight on the gas block and a removable rotary diopter rear mounted on the receiver rail. It ships with a 40-round magazine.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The stock is missing the insert that allows it to lock to the handguard when collapsed. The exterior shows minor, superficial scratches and blemishes.
What's Included
- 1x 40-round AR-15/STANAG-pattern magazine (GI-style)
- SIG Sauer SIG556 owner's manual
This SIG556 Classic uses a semi-automatic, long-stroke gas piston action with a two-position adjustable gas regulator. The 16-inch barrel ends in a plain crowned muzzle, and the right-side reciprocating charging handle mirrors the classic 55X manual of arms.
Sight equipment consists of a front sight on the gas block and a removable rotary diopter rear sight installed on the receiver rail. An integral Picatinny top rail provides a solid mounting surface along the receiver.
The rifle retains the Classic-series Swiss-style ergonomics, including a triangular side-folding polymer stock (handguard latch insert missing on this example; stock does not lock when folded) and a ribbed polymer pistol grip. Two-piece polymer handguards with ribs and ventilation slots aid control and heat dissipation.
Construction pairs a stamped steel upper with a 7075-T6 forged-aluminum lower receiver. Controls include a manual safety selector marked S/F and a left-side bolt catch/release. It feeds from AR-15/STANAG magazines and includes a 40-round magazine; length of pull measures 14.3 inches.