F Spikes Tactical Barrel 5.56 - 16in M4 LE w/ Gas Block, SB51605-M4G $337.99 SB51605M4G show more like this Dvor F Spikes Tactical Barrel 5.56 - 16in M4 LE w/ Gas Block, SB51605-M4G $337.99 SB51605M4G show more like this Free Shipping on most orders over $49 Optics Planet