For Sale Mk12 mod 0 ish Rifle. Bcm upper , Toolcraft bolt carrier, Geissele Airborne charging handle, PRI Gen iii hanguard in black , PRI peq top rail , A.r.m.s. inc #40 flip sight , PRI front sight gas block flip sight crossbolt model , White oak Armament 18" 8 twist stainless steel polished...