PBY Catalina: Color of waist MGs?

I'm working on the Academy 1/72 scale PBY-5, and I've got a color question that my (limited) references don't address:

Regarding the waist gun positions: what color should the mounts and shield be? The kit's instructions say to paint the interior of the fuselage primer green, which matches the picture of a restored PBY that I've found online.

I figure the MG mount and shield would not be primer green, as they weren't made of aluminum, and were not installed when the basic airframe was painted with the green primer. What color, then? I'm thinking that they were probably standard navy battleship grey-- anyone know for sure?

TIA!

-Bill

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RC Boater
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