K4B/K4B68
5.56 NATO or 6.8 SPC (new 2010) cal., GIO, 20 in. match grade chrome moly steel button rifled threaded barrel with flash suppressor, adj. A2 rear sight, A2 buttstock, adj. front post sight, A2 upper receiver and handguard, 8 1/2 lbs. Disc. ...