Those were the synthetic stocks they used before going to the hollow ones
I picked one up for my 20" 10/22RR a while back & realy like the stock..
Nice pics & Welcome to the forum 22Mike
Gary
Here's a Pic of mine with the same stock..
NOTE: Gibson Guitar Gig Bag, Useless for the Blueshawk but makes a super fine rifle case..Guitar is in a "Real Case"