SIG SAUER's upcoming SIG556xi modular rifle will be available in 5.56x45, 7.62x39, and .300 AAC BLK. The barrels and Bolts will be swappable between calibers. According to rumors they can accept AK and AR magazines.
SIG 556xi - Standard model, comes with standard side-folding stock (with removable cheek pad)
SIG 556xi Carbon - Enhanced model, comes with carbon fiber quad rail, and skeletonized side-folding stock
SIG 556xi Russian - Similar to standard model but chambered in 7.62x39mm Russian only, comes with standard side-folding stock (with removable cheek pad)
SIG P556xi - Pistol model, comes with quad rail and SB15 forearm brace
SIG 556xi - Standard model, comes with standard side-folding stock (with removable cheek pad)
SIG 556xi Carbon - Enhanced model, comes with carbon fiber quad rail, and skeletonized side-folding stock
SIG 556xi Russian - Similar to standard model but chambered in 7.62x39mm Russian only, comes with standard side-folding stock (with removable cheek pad)
SIG P556xi - Pistol model, comes with quad rail and SB15 forearm brace
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