New Colt 16inch M4 barrel removed from a N.I.B. recent production Colt LE6920 M4 carbine. Yes the barrel extension has M4 feed ramp enhancements. Yes the barrel is chrome lined and correctly marked C MP, 5.56 NATO, and 1x7. Yes the FSB/front sight tower is the slightly taller "F" marked one for use with flat top upper receivers. Yes new Colt 16inch M4 barrels are not near as easy to come by as new Colt 14.5inch M4 barrels are. I only have one available and am asking $385.00 plus shipping. Please contact me via e-mail through the site or direct at CLM4@EV1.NET.