I answered my own question about 2 hours after I posted it. I was rereading my RENE newsletter (May 2012) and I saw where Ruger had started a new prefix for the 10/22's. It is 820. So I figure that it was bought and taken apart for the pieces (stock, barrel, receiver/trigger group).
I had a stock from an old 10/22 that I tricked out (birch but with METAL barrel band and butt plate) and a new barrel from a 10/22 that I modified for a customer (Tactical Solutions threaded barrel, Butler Creek stock, Harris bipod, 3-9x scope, extended mag release, oversized bolt handle; he's going to suppress it for dispatching varmits around his house).
Put the old stock, new barrel and receiver together last night and I'm back to having a plain jane, iron sights plinker 10/22 (which, in my opinion, everyone should have).
USAF Retired E-8
RCA, RENE Member