Most likely, finish and accessores
The value of an NRA Special Edition 22 Ruger pistol actually depends on a couple different things. A couple of these things would be the age and condition of the pistol.
Magazine
Go to Ruger's web site to find out.
100-500 USD or so
Model numbers 117 vs 207 and external physical features
Primarily in the magazines; Mark II has a bolt hol open also
100-300
Redhawk is a double action revolver, as opposed to the single action Blackhawk.
You need to contact Ruger for the answer to make sure the warranty isn't voided.
50-200
125 USD
I got mine for a steal at a pawn shop for $270. It looks and fires brand new! I have got offer for around $350 from people who want to buy it, but I will not part with it!