Like you Cory, I've discovered that trying to find clear period photos, inside or outside, where the gun sight can be seen, is like trying to find Hitler's dog!
However, I did find one good, side on shot of a FAA Corsair II in flight, taken during the period in question. The gunsight was virtually in silhouette, due to the lighting, but judging by the shape, bulk, and the shape of the mounting, it looked like the gyro sight.
I tried to copy the photo, from the Schiffer FAA book on my computer, but, due to the type of file, I couldn't even high-light it, so unable to post it here I'm afraid.