Colt 14.5 5.56 1/7 socom profile barrel. Got off of apex gun parts, unknown surplus. Bore looks good, groups under 2moa with m855. I cut a section of an old a2 flash hider and put the og a2 in front to get the barrel length just over 16" with intentions to pin and weld but never got around to it. Located in Killeen $380. Text 254-389-4582.