RUGER SR-556/SR-556 CARBINE
5.56 NATO or 6.8 SPC (mfg. mid-2010-2011) cal., GPO, 10, 25 (6.8 SPC only, disc. 2011), or 30 shot mag., 16.1 in. barrel with flash suppressor or target crown, matte black finish, four position chrome plated gas regulator, quad rail handgua...