Can you do a Carbine Club data sheet on just the barreled receiver assembly?
If one was never submitted before on that S/N it will at least give a "ground zero" for future collectors. (I have heard they've been flooded w/ data sheets since the CMPicon sales started, but it still would be useful to fill it out now and submit it later, I should think.) I've a friend who's a member in the club, and he's recorded some of my carbines in the past few years.