Is it the number 28 or the 31? The '42 catalog I have doesn't show the sights used. The catalog I have that shows sights from the '30's says the 28 is the one. Strobel's book says 31. I would prefer the correct sight for the rifle. The SN is 400938. I'm in the market for the correct sight.

"Americans have the right and advantage of being armed-unlike the citizens of other countries whose governments are afraid to trust the people with arms." James Madison