Nearly all of the 12 gauge Red labels have stainless receivers. The only chrome moly receiver 12 gauge Red Labels made were the earliest 410- prefix guns....reportedly totalling 419 guns in addition to the 1,000 chrome moly receiver Ducks Unlimited 12 gauge Red Labels with nickle finish receiver.
The highest chrome moly recever 12 gauge known is 410-03144.
After that...all stainless...over 65,000 of them.
Ruger did make a few blue receiver 12 gauge Red Labels for Orvis, but quantities were very limited...probably not more than 200 each of the 26" and the 28" models. These were the first Red Label Shotguns to have any choke tubes factory installed by the factory (Ruger also built some 20 Gauge blue receiver Red labels for Orvis at the same time).
One other 410- prefix Red Label is known with choke tubes...a special presentation gun to one of the directors on Ruger's board.
Choke Tubes did not become standard on the 12 gauge Red Label shotgun until the 411- prefix.
Chet15