Sig Sauer SIG556 SWAT 5.56 NATO Semi-Auto Rifle, 16 inch Barrel, Long-Stroke Gas Piston, Quad-Rail, U.S.-Made, Includes 2 SIG 30-Round Magazines
This U.S.-made SIG556 SWAT stands out with its factory aluminum quad-rail handguard labeled 'SIGARMS – 556,' a full-length 1913 top rail, and an adjustable gas regulator on a long-stroke gas piston system. It features mixed 'SIGARMS'/'SIG SAUER' period branding, a folding front sight at the gas block, and an AR-15 pattern magazine well. It comes with two SIG-branded 30-round polymer magazines; one is fitted with a clip-on coupler, and neither has integral side-coupling lugs.
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: There are minor superficial scratches and blemishes present.
What’s Included
- Sig Sauer SIG556 SWAT 5.56 NATO rifle
- Two 30-round SIG-branded polymer AR-15 pattern magazines; one fitted with a clip-on coupler and neither with integral side-coupling lugs (one marked 'SIGARMS' and one 'SIG SAUER')
The SIG556 SWAT configuration pairs a 16 inch barrel with an A2 flash hider on a threaded muzzle and a long-stroke gas piston, rotating-bolt action. An adjustable gas regulator supports reliable operation with 5.56 NATO, and the system is rated for a 30+1 capacity.
The factory aluminum quad-rail handguard is T-marked and labeled 'SIGARMS – 556,' matched with a full-length 1913 top rail. The receiver set uses an aluminum-alloy upper paired with a polymer lower/trigger housing; controls include a right-side reciprocating charging handle and a bilateral two-position safety. The lower accepts AR-15 pattern magazines for broad magazine compatibility.
Sighting and furniture features include a folding front sight integrated at the gas block and no rear sight installed. The adjustable polymer stock incorporates a rear QD sling socket, while a fixed front sling loop is mounted up front. The SIG polymer pistol grip has a ribbed frontstrap for secure purchase.
This U.S.-made example is marked on the left receiver 'SIG 5.56 NATO, SIG SAUER INC, EXETER, NH, USA,' and shows mixed 'SIGARMS'/'SIG SAUER' period branding. It ships with two SIG-branded 30-round polymer magazines—one fitted with a clip-on coupler and neither with integral side-coupling lugs—one marked 'SIGARMS' and the other 'SIG SAUER.'