Thanks Shinpachi; and at $1,000 a piece they should be making replicas out of metal with working parts!
I did happen to find a post from earlier this year that a model maker out of eastern Europe (?) called Eduard had created and was selling a fairly small batch of resin cast Revi gun-sights. Those 1:1 models must have been snatched up quickly because I only saw the one "preview" article and no mention since.
Again, thanks. Perhaps someone will make some full scale replica models of gunsights; this may be a small market but I think there would certainly be some interest in them.
Derek