This new Sig Sauer 556XI pistol fires the 5.56 round. 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/brace 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 hand guard.
- 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
- Caliber convertible: 5.56 NATO / 7.62 x 39mm / 300 Blk