MARK 12 MOD O GEN II SPR RIFLE
5.56 NATO cal., 18 in. Douglas stainless steel 1:7 or 1:8 twist barrel, AE brake and collar, standard trigger, PRI flip-up front gas block front and rear sight, A2 or B5 6-pos. stock, forged aluminum flat-top upper and Mil-Spec forged lower...