I have a 14.5" Colt M4 barrel for sale. The front sight post has been shaved and painted with high heat paint in order to fit under a free floating rail. It had a flash hider pinned on it at one time but was removed without causing any damage to the threads. It will come with a gas tube with roll pin. The barrel has around 2,000 rounds through it. $300 in the Graham/ Puyallup area.