With the turret under his control, Wolf watched the gun tube.

The garrison retrieved the abandoned gun tubes and dragged them into the city.

The mount is completely open apart from a mantlet around the base of the gun tube.

And that's another place where their shorter gun tubes are going to help them, Mer-lin reflected.

"The strength of the existing gun tubes would still limit shot weight and velocity," he said.

He was relaxed, his arm resting loosely on the gun tube.

That's the purpose of the rings around the gun tubes.

The gun tubes have been a much greater problem.

She tilted the gun tube on its mounting and sighted down the top.

The word cannon is retained in some cases for the actual gun tube but not the weapon system.