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
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