About this detail of the Tiger
The gun had recoil, and so it consisted of a moving barrel in a fixed sleeve (Schutzrohr). I have made a drawing of the barrel, working from German originals, but I have not yet drawn the sleeve.
This diagram is an overall view of the gun barrel and breech, with a 1.35 rule in inches and centimeters. It shows how the was screwed on at the left, concealing some of the length of the barrel.
This unscaled drawing shows the precise lengths and radii of the exposed part of the barrel, and will be useful for anyone turning a master model. Unfortunately, since I have not yet found the position of the barrel in relation to the fixed sleeve, you cannot get the overall external length.
The barrel was in two parts; an inner sleeve (Seelenrohr) and an outer jacket (Mantelrohr). These are both modelled here. Notice that a ring was screwed on to hold them together. I am guessing that they were painted in primer during manufacture; there exist photographs of tanks that seem to have replacement barrels painted in a dark colour.(The latest version of this article)