Have a few questions regarding M1 Carbines.

One of my friends has an authentic paratrooper stock that was brought back by a relative while in occupation in Europe during the mid-late 1940's. I do not remember the specifics but that's not necessarily important.

It does not have a barreled action just the stock and hardware. He's looking to put a Inland barreled action to complete it. Does anyone know if there were a serial number ranges that would be appropriate for it? Were Inland the only producers of the paratrooper configuration?

Also, I recently used...
http://www.bavarianm1carbines.com/ as a resource for my IBM restoration project for subcontractor parts as well as what manufacturers produced what parts and which companies swapped parts with each other. Is this a fairly accurate resource for that sort of information?

Thanks for the help anyone can offer,

Andrew