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Action - Semi-Auto
Caliber - .223 Rem./5.56 NATO
Barrel Length - 16"
Weight - 8.2 Lbs.
Sights - Flip-Up Post/Picatinny Rail
The SIG556 HOLO takes the high-performance two-position adjustable gas piston operating rod system engineered by Swiss Arms and marries it to a CNC-machined 7075-T6 grade aluminum forged trigger housing that not only cuts the rifle's weight by a pound but is designed to accept standard AR magazines. Every SIG556 HOLO has a 16" military grade cold hammer-forged barrel, chambered in 5.56mm NATO, with a twist rate of 1 in 7". The buttstock is collapsible with a rubber butt pad and a number of sling attachment points. The vented non-slip polymer forearm has three picatinny rails for accessory mounting. This rifle's stock, metal, and bore are all in very good condition.