David
That made a big difference in the pictures. The gun is definitely blue! As you now know, from others comments and your experimenting, lighting is always an issue. In these improved pictures, there is still some glare on the barrel. I'll offer a few more suggestions.
First, pay close attention to what you see through the camera, before you take the picture. Look for glare, in particular. We have a southern exposure, which provides a lot of sunlight all year around, except for those gray days we have here in Oregon - frequently! If I see glare, I move the table back away from the window. If I still see it, I lower the window blind more. They provide a lot of diffusion.
Second, I'm using a Google Pixel 3 phone for all my pictures. It does have a very good camera. I made a simple framework to hold the camera, which lies flat in the frame. This provides the stability for the camera. The frame has two adjustments: vertical and lateral. These, combined with the cameras magnification, make it easy to capture detail.
Third, instead of tilting the camera slightly, I tilt the gun just a bit, into or towards the window. I find that, looking at the image on the camera screen before taking the picture, lifting the butt of the gun will bring out the roll markings much better. I use a piece of 3/8" to 1/2" dowel to hold the gun in the titled position. This is usually visible in the pictures, when I do this.
In my woodworking shop, I always follow the axiom of "Measure twice, cut once". My comments here, about taking pictures, follow that guideline: Get what you want on the camera screen first, then take the picture.
Regards, Mike Priwer