Originally Posted by sensei9
Bought a used Bushmaster barrel. For some reason (known only to him) the previous owner had removed the front sight tower, but left the gas tube in it. When I got it, I removed the gas tube roll pin, but couldn't get the gas tube off. I don't want to ruin the gas tube getting it out, but I want to remove it for inspection before I put the whole thing together. Anyone have any idea if bushmaster uses some sort of adhesive on the gas tube? Don't want to heat it up if I don't have to.
I usually replace the gas tube if I gotta remove it, even though they are pretty tough. If the gun got fired any, you will have some carbon built up in that area, so it will take a little effort to get it out. Brownells has a clamp on gas tube removal tool just for this task. Barring that, take vise grips, clamp it down (but not so tight you crimp the tube) and give it a good whack with a 2lb hammer. I have never seen it take more than one whack to break the tube loose. Remember, when you are installing a gas tube, make sure there is clearance on both sides of the tube between the barrel nut teeth.