two in one question

Thanks guys much appreciated

Nice link stik, those slats do look like wood.

probably just bluing on the magazines

here is a good museum walk around link...

http://www.equipdetails.com/flak38.htm

Not entirely sure on the first question, I have a close up image, and I think they are woodn, but its hard to tell.

I can't imagine they would be painted. Photo's of the same gun, a museum piece, show them the same as the gun. There would be a risk of paint flaking off and going into the gun.