The Sig556xi by Sig Sauer provides unparalleled modularity in barrel length, caliber, magazine type, and stock configuration. It features a 3-position adjustable gas piston operating system with a rotating bolt, a Swiss-style folding stock with removable cheek riser, ambidextrous controls, locking flip-up sights, and a polymer handguard compatible with Magpul MOE accessories. This model accepts any Mil-Spec magazines compatible with the lower.
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