AR-style rifle chambered in 5.56 NATO. Original versions include 14.5", 16", 18" or 20" chrome-lined barrel; free-floating aluminum quad rail fore-end with four M1913 Picatinny rails; threaded muzzle with standard (0.5x28TPI) pattern; aluminum upper and lower receiver is machined; black anodized finish; 30-round magazine; flattop upper; various configurations available. New G2 versions only available as 5.56/16", introduced 2016.