Guns manufactured at that time would have been rust blued, so temperatures would not have been a consideration. It would seem to me that would not explain why the cylinders were left in the white. Maybe Colt simply thought the guns looked better with the cylinder in the white. In days of yore, it was not uncommon to see military and commercial rifles with bolts in the white, and sometimes even receivers. I am thinking cylinders, bolts, and receivers were left in the white as a matter of aesthetics. But, what do I know?
Did your ASM Walker leave the factory un-blued?
I took other pictures of the process of making this holster, and would gladly make up a tutorial showing how this one was made. How should I do this? Just add to this post, or create a new one? If a new one, where do I place it? Is there a limit to how many pictures we can include on a single post? I don't want them to get all mixed up, or not even show, like they did at the beginning of this thread.
Here is another very similar holster I made for my replica Spiller and Burr revolver about 10 yeras ago:
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