Combining the best of the AR and AK with the legendary reliability of the Swiss 550 Series, the SIG556xi is the most adaptive tactical carbine ever. The SIG556xi accepts multiple calibers and magazine types, while offering ambidextrous controls and the next-generation, three-position adjustable gas piston operating system. A unique serialized upper allows you to swap lower receivers for maximum component flexibility. The 556xi accepts AR-pattern 7.62x39mm, AR-15/M16 STANAG, or AK magazines (with an AK-style lower installed). Easily adapt to your environment with 10", 14.5" or 16" barrel lengths available. A reversable single point sling swivel keeps the SIG556xi always in reach.
The SWAT model features: an AR lower receiver, a Swiss-style folding stock, a polymer/alloy handguard with a quad rail, a full-length picatinny top rail, removable back-up sights, a removable cheek riser, and the ergonomic xi grip with a storage compartment.