Well Ruger has 3 "stock" colors and 8 distributor exclusive colors. Maybe they assign a serial number and a color to the build sheet aka the sticker on the box before they are even born and pull "x" number of them off the line to become Plum Brown, O.D. Green, Cobalt, Stone Gray, Crushed Orchid, Tungsten, Flat Dark Earth, or Midnight Bronze (love that color BTW!) after the fact?
Sounds plausible.
The two Silver's I have seen in person are much lighter than yours. So, you got one of the more expensive, special dealer cerakote's for the price of the basic three colors they are selling? I wouldn't mind having the OD Green one, if I didn't have to pay anymore than what you did.
That's kinda what I'm thinking. The silver one they had in the case was bright silver, just like the pic on Rugers website.