Sig Sauer SIG556XI Standard 5.56mm Rifle (LE)



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.


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

Product Specifications

  • Item Number: R556xi-16B-S
  • 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


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