Sig Sauer SIG556xi Standard 5.56mm Adaptive Tactical Carbine


In stock


The evolution of the SIG556® platform, the new SIG556xi gives you unparalleled modularity in barrel length, caliber, magazine type, and stock configuration. A folding stock combined with ambidextrous magazine release, bolt release, safety selector and charging handle. Accepts any MIL-SPEC AR-15/M4/M16 or AK-style magazines depending upon lower. Available with a polymer or aluminum handguard.


  • 3-position adjustable gas piston operating system with rotating bolt
  • Swiss-style folding stock with removable cheek riser
  • Ambidextrous controls
  • Locking flip-up front and rear sights
  • Polymer handguard (compatible with Magpul® MOE® accessories)
  • Caliber convertible: 5.56 NATO / 7.62 x 39mm / 300 Blk

Firearm Specifications

  • Item Number: R556xi-16B-C
  • Caliber: 5.56mm NATO
  • Overall Length: 35.8 in / 912.9 mm
  • Rifling: 1 in 7in
  • Number of Grooves: 6
  • Barrel Length: 16.0 in / 406.4 mm
  • Weight w/out Mag: 7.1 lb / 3.22 kg
  • Mag Capacity: 30 Rounds
  • Accessory Rail: Yes
  • MSRP: $1 466.00 – $1 599.00
  • CA Compliant: No
  • MA NJ NY CT Compliant: No
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Sig Sauer SIG556xi Standard 5.56mm Adaptive Tactical Carbine


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