I've got a slight issue I need help with. I'm steadily working along on my Airfix Spit Mk 1 with Watts 2 bladed prop and I see that the birds from 1939 to at least the early fall of 1940 had protruding flash suppressors on the outer wing guns, at least before the red arming tape covers were added in early 1941. I've done web searches for .303s with flash suppressors and they look to be cone shaped. But the Spit suppressors I've seen in pictures from the 1939-40 period (assuming they are suppressors and not some other housing) seem to look more cylindrical in shape.
So I am scratching my head a little here. I can't necessarily leave them off as they are a rather prominant feature on Spitfires from the pre-war period.