Hi Guys,
So I've taken a few pics of all the barrels I have for comparison, the Tamiya kit one, full RC option (very loosely assembled), the BrassBarrels one, and the Schumo-Kits (Axels Models in Germany). I am not a photographer and the pics aren't brilliant but I hope they'll give you an idea of the best one for you. I am by no means an expert and am offering opinion based on the best references I have to hand (the book Armor PhotoGallery Tiger 1, Part 1 by W J Gawrych. pages 39-40, which are detailed photos of the Bovington Tiger and www.tiger1.info for the muzzle break join. I have only one example of each barrel and am assuming each to be a "typical" production. I also do not know if the requirements for the static Tamiya kit are the same as the RC version so I'll just comment on how it effects the RC kits requirements. I apologize in advance for any misteaks. (lol)
[img.nr] http://www.btinternet.com/~wladyslaw/barrelpics/barrels.jpg[/img.nr]
Well, here they all are. The Schumo at top, Tamiya kit in the middle and the BrassBarrells at bottom. They are all of slightly different lengths - the Schumo about 1mm longer than the Tamiya, the BB about 1mm shorter (discounting the smaller diameter areas at both ends designed to fit within the muzzle brake and within the mantlet/recoil unit. The centre detail (where the two different diameter sections are joined) also differs in position - the Schumo about 1mm closer the muzzle brake end compared to the Tamiya and the BB about .5-1mm closer to the mantlet end. I have no idea which is correct. The finish of the Schumo barrel is noticeably smoother to touch than the BB, but I think this insignificant after a coat or two of paint is applied.
[img.nr] http://www.btinternet.com/~wladyslaw/barrelpics/end1.jpg[/img.nr]
These are the ends that fit within the mantlet/recoil unit. The most obvious difference being the BB barrel (left) has not been machined to have two flat planes and the slot, to fit the Tamiya recoil unit. I guess you could machine them yourself or file them flat and cut a slot if needed.
[img.nr] http://www.btinternet.com/~wladyslaw/barrelpics/end2.jpg[/img.nr]
Here are the ends that fit into the muzzle brake. The Schumo left, Tamiya centre and BB right. Once again the BB is notable for the lack of machining to fit within the Tamiya kit muzzle brake. Once again you could rectify with a little work. The Schumo stands out for being shorter than the other two by about 3mm in length. www.tiger1.info shows this to be incorrect. I believe from the diagrams that the end of the barrel should just protrude into the visible area of the muzzle brake. I guess this is not critical if you have the full RC as the optics get stuffed through the barrel and obscure the inside of the muzzle brake.
[img.nr] http://www.btinternet.com/~wladyslaw/barrelpics/middle.jpg[/img.nr]
And now the all important middle bits that can be seen! Schumo top, Tamiya centre and BB bottom. The Schumo is very similar to the Tamiya in profile (and both seem accurate compared to Bovington Tiger pics), only criticism being the "notch" on the Schumo is a little too long (easily rectified with a tiny amount of filler.) The recess (hardly visible on the photo) is very subtle and seemingly accurate. On the Schumo barrel you can both see and feel it. The BB barrel is... um, not as accurate as the other two. All the bits are there but not quite in the correct proportion/position and no "notches." Overall it doesn't quite have the same look and profile as depicted in the photos of the Bovington Tiger barrel.
Conclusion: I must get a better camera, and the Schumo-Kits barrel is the one going on to my model.