I have a nice sporterized 03A3, when I got it was not set up for a scope but had a nice Lyman all steel aperture sight. It now wears a nice Weaver steel tube 3 X 9, just looks right. The peeps are still there and I use them occasionally.
I have probably a dozen old Weavers laying around, guess I like them but they have gotten pricey lately. Picked up a mint K4 a couple years ago, it doesn't have the centered cross hairs. I am not sure when that was changed.
Dave