SIG Sauer SIG 556 5.56x45mm 16” Semi-Auto Rifle Folding Stock & Box
SOLD FOR: $1,584.00
LSB#: LSB251029CW001
Make: Sig Sauer Inc.
Model: SIG 556
Serial Number: 44A 002236
Year of Manufacture: Modern
Caliber: 5.56 / .223
Action Type: Semi-Automatic, Short Stroke Gas System, fed by detachable AR15 pattern magazines.
Barrel Length: 16”. 17.5” with A2 flash hider
Sights / Optics: The front sight is a hooded post sight and there is no rear sight. The top of the receiver has a M1913 picatinny rail for the mounting of optics. The rear sight is a Sig Rotary 4 position diopter. There is a Chinese made replica of a Trijicon ACOG optical sight included.
Stock Configuration & Condition: The forend is a 2 piece clamshell polymer. The pistol grip is a 550 series style pistol grip with storage. The stock is a folding stock with rubber butt pad and cheek riser. The furniture shows mild handling wear with some scattered surface level lines and minor rub wear. There are no visible chips or cracks. Overall this polymer furniture set is in Very Good condition.
Magazine Quantity & Condition: This rifle includes two 30rd 5.56 detachable aluminum magazines in Very Good condition.
Type of Finish: Anodized Black
Finish Originality: Original
Bore Condition: The bore is bright and the rifling is sharp. There is no visible pitting or erosion in the bore. There is minor fouling in the bore. In this writer’s opinion the bore rates 9/10.
Overall Condition: This rifle retains about 98% of its metal finish. There are light scratches and handling marks throughout. The receiver has a couple more notable scratches on the right side. The markings are clear. Overall, this rifle rates in about Very Good condition.
Mechanics: The action functions correctly. We did not fire this rifle. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.
Box, Paperwork & Accessories: Box, 2 mags, sight rails, and a Chinese made replica of a Trijicon ACOG optical sight, colloquially called a “Chicog”.
Our Assessment: This SIG Sauer SIG 556 represents the American-market adaptation of the Swiss SG 550 series, blending European military design heritage with U.S. manufacturing and compliance features. Built around a robust short-stroke gas piston system, the SIG 556 was intended to deliver enhanced reliability over traditional direct-impingement rifles, particularly in adverse conditions. Its lineage is evident in the distinctive receiver profile, folding stock, and rotary diopter sight system, all of which echo the proven service rifles developed by SIG for military use abroad.
Chambered in 5.56x45mm and fitted with a 16 inch barrel, this rifle is well suited to a wide range of ammunition while maintaining controllability and durability. The bright bore with sharp rifling and no visible erosion indicates limited use, with only minor fouling present. The included optic elevates the rifle’s capability, providing a sighting solution well matched to the platform’s intended role. The combination of the top Picatinny rail, hooded front sight, and SIG rotary diopter rear sight offers both redundancy and flexibility in sighting options.
Overall, this example presents in very good condition, retaining approximately 98 percent of its original anodized finish with only light handling marks and a few more noticeable scratches on the right side of the receiver. The polymer furniture shows mild surface wear consistent with careful use and remains free of cracks or structural issues. Mechanically sound and complete with box, magazines, optic, and accessory rails, this SIG 556 stands as a well-equipped and desirable semi-automatic rifle from SIG Sauer, offering a distinctive alternative to standard AR-pattern rifles with strong pedigree and practical performance. Please see our high resolution photos and good luck on your bid! MF/MA
