SIG Sauer SIG556xi Russian 7.62x39 Semi-Auto Rifle with 16 in Threaded Barrel, AK-Mag Lower, Folding Stock
The SIG Sauer SIG556xi Russian is a modular, USA-made 7.62x39 semi-automatic rifle configured for AK-pattern magazines. It features a 16-inch threaded barrel with a birdcage flash hider, a short-stroke gas piston system with a multi-position regulator, and a side-folding polymer stock. This variant includes a full-length 1913 Picatinny top rail and folding iron sights. No optic is included. The SIG556xi line was introduced in 2014 and discontinued by 2017.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are some minor scratches and blemishes present.
What’s Included
- Factory SIG Sauer cardboard box (serial-matched)
- Steel AK-pattern, rock-and-lock magazine
This Russian-configuration SIG556xi is chambered in 7.62x39 and built around SIG's modular, multi-caliber architecture. It uses a serialized upper and accepts different lowers to support either AR- or AK-pattern magazines; this example is set up with the AK-mag lower and an AK-pattern rock-and-lock interface. The barrel is clearly marked 7.62x39.
The rifle runs on a short-stroke gas piston with a rotating bolt and an adjustable, multi-position gas regulator for tuning across ammunition and conditions. The side-mounted reciprocating charging handle is user-swappable, and the controls include an ambidextrous magazine release and an ambidextrous rotary safety selector.
It carries a 16-inch, threaded barrel capped with a birdcage flash hider and a full-length 1913 Picatinny top rail. Folding front and rear iron sights are installed. No optic is included.
Ergonomics and handling are enhanced by a side-folding polymer stock with a rubber buttpad and a QD sling socket at the hinge, plus a polymer pistol grip with textured panels. The ventilated, free-float-style handguard uses elongated slots for heat management and accessory attachment. Factory specs list an approximate OAL of 35.1 in extended and 26.0 in folded, with an unloaded weight of about 7.5 lb (without magazine).
Receiver markings read: "SIG556XI. MULTI-CAL SIG SAUER, INC, EXETER, NH, USA." The SIG556xi series debuted in 2014 and was discontinued by 2017, placing this rifle within that production window.