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Swiss Type Folding Stock
Rotary Diopter Sighting System
For Special Forces requiring an accurate, more potent rifle, chambered in 5.56 x 45mm NATO, the SIG551-A1 sets a new standard for dependable operation and function. Chambered for the widely used 5.56 x 45mm NATO caliber using Swiss Polymer magazines, the SIG551-A1 features a distinctive Swiss folding stock, and a M1913 rail for accessory attachment. The 16" barrel features a four-grove rifling and a twist rate of 1:7". The SIG551-A1 measures 36.1" but can fold to 26", making it ideal for situations where maximum maneuverability is required.