SIG Sauer SIG556R 7.62x39 Semi-Auto Rifle, 16 in Barrel, Long-Stroke Gas Piston, Adjustable Gas, Polymer Skeleton Stock, 30+1
The SIG Sauer SIG556R pairs the proven 7.62x39 cartridge with a Swiss-inspired, long-stroke gas piston system and an AK-pattern rock-and-lock magazine interface. This U.S.-made example features a 16-inch barrel with flash hider, a two-position adjustable gas regulator, and a full-length MIL-STD-1913 top rail. It presents in excellent condition and includes a factory box with matching serial label dated 11-OCT-2013.
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: The rifle retains its original factory finish with minimal evidence of handling. The long-stroke gas system and receiver surfaces display no notable wear. The action cycles smoothly and reliably.
What’s Included
- 1x 30-round steel AK-pattern magazine
- Factory SIG Sauer cardboard box with model code R556-762R-16B and matching serial label
The SIG556R is built around a long-stroke gas piston with a two-position adjustable gas regulator at the gas block, designed for robust cycling with the 7.62x39 cartridge. Its 16-inch barrel is threaded and fitted with a flash hider, and uses a 1:9.5 twist rate suited to common 7.62x39 projectiles.
Feeding is via an AK-pattern rock-and-lock magazine interface with a paddle-style magazine release, and this rifle comes with a 30-round steel AK-pattern magazine. Capacity is 30+1.
Topside, a full-length MIL-STD-1913 rail runs the length of the receiver, while the ribbed polymer handguard includes integral rail sections and a B&T-marked accessory rail segment. Sighting equipment includes a folding rear sight at the gas block, no front sight is installed.
Furniture consists of a polymer skeleton stock with a 13.0-inch length of pull and a ribbed polymer pistol grip. The receiver is marked "SIG556R, 7.62x39, SIG SAUER INC., EXETER, NH, USA," and the box label date is 11-OCT-2013 with a serial that matches the receiver.