The Nylon 66 is "Apache Black", IIRC. Somewhat less common than the usual brown ones, but not "rare". The rare nylons are the bolt actions- I forget the model number. Also, in the 66s, Kmart sold a green stocked version, but I've never seen one outside a Kmart! I have a fairly freckled finish lever action Nylon 76.
Oh, here's a link about the "Nylons":
http://www.chuckhawks.com/rem_nylon_rifles.htm
Say, is your Nylon a 66 or a 77 (detachable box mag version)? The 77 would be much less common, according to the above.
The little bolt action wood stocked Remingtons turn up around here from time to time, but are usually brown, rather than blued. Nice ones are scarce.