Sig Sauer SIG 556 SWAT 5.56 NATO, 16-Inch, Long-Stroke Gas Piston, Quad-Rail, Threaded Barrel with 3-Prong Flash Hider
This SIG 556 SWAT stands out with its early SIGARMS-marked receiver from Exeter, NH, and the SWAT package of features built around a robust, long-stroke gas piston system. It offers a full-length top Picatinny rail that bridges the receiver and handguard, an aluminum quad-rail with numbered positions, and a threaded 16-inch barrel with an installed 3-prong flash hider. It is in very good overall condition with an excellent bore and comes with four 30-round magazines.
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: Light handling marks are present on exterior surfaces from prior use. The bore appearance is consistent with its excellent rating. See the photos for close-up views of the finish and markings.
What’s Included
- Sig Sauer SIG 556 SWAT rifle (5.56 NATO)
- Four 30-round magazines (combination of USGI-pattern aluminum and Troy Industries BattleMag polymer magazines with pull-tab baseplates)
The SWAT configuration equips this rifle with an aluminum quad-rail handguard featuring T/L/R/B-numbered rails and a full-length 12 o'clock Picatinny rail that runs across the receiver and handguard. A folding front sight is integrated at the gas block, and a front sling loop is positioned at the gas block. No rear sight is included.
Its operating system is a semi-automatic, long-stroke gas piston with a two-position adjustable gas regulator for tuning to conditions. The rifle uses a right-side, reciprocating charging handle and a manual safety. It accepts standard AR-15/STANAG magazines, and this example comes with a mix of USGI-pattern and Troy BattleMag magazines.
The 16-inch barrel is threaded and fitted with a 3-prong flash hider. The collapsible, carbine-style stock provides compact handling, with an 11.0-inch length of pull noted. The ribbed 55X-style pistol grip delivers a familiar 55X-series feel.
Construction details include a steel upper receiver finished in black Nitron and a 7075-T6 aluminum lower with a black hard-coat anodized finish. This U.S.-made rifle features early SIGARMS (Exeter, NH) receiver markings and a stated capacity of 30+1.