Sig Sauer SIG556 Classic 5.56 NATO Semi-Auto Rifle, 16-inch Threaded Barrel, Diopter Sights, Folding Stock
This U.S.-made Sig Sauer SIG556 Classic combines a long-stroke gas piston action and a two-position adjustable gas system with a 16-inch threaded barrel and birdcage flash suppressor. It is equipped with diopter iron sights and a receiver-length top Picatinny rail on the upper receiver (no forward/top rail over the handguard), plus a right-side folding, skeletonized polymer stock that locks into a handguard catch. The rifle is compatible with AR-15/M16 (STANAG) magazines and includes one SIG factory 30-round magazine with coupling lugs.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are scattered scratches and handling marks. The polymer dust cover has deteriorated. There is scratching on the ejection side consistent with normal operation.
What's Included
- 1x 30-round SIG Sauer factory detachable box magazine with side-coupling lugs
The SIG556 Classic uses a semi-automatic, long-stroke gas piston system with an adjustable two-position gas regulator. It features right-side ejection and a design focused on reliable operation.
The 16-inch barrel is threaded and fitted with a birdcage flash suppressor. This setup provides a standard 5.56 NATO configuration while maintaining a compact overall profile.
Sighting is via a hooded post front on the gas block and a rotary diopter drum rear. A receiver-length top Picatinny rail on the upper receiver (no forward/top rail over the handguard) provides mounting for compatible accessories.
The black polymer, right-side folding skeletonized stock latches into a handguard catch when folded and provides a 13.0-inch length of pull. A two-piece polymer ribbed handguard completes the classic configuration.
Construction pairs a machined aluminum-alloy upper receiver with an integral 1913 rail with a forged aluminum lower. The rifle accepts AR-15/M16 (STANAG) magazines, and it ships with one SIG Sauer factory 30-round magazine that includes side-coupling lugs. Stated capacity is 30+1.