When I was assigned to the Coast Guard recruit training center armory, we had HUNDREDS of M1's which were issued to recruits for d & c practice. I don't recall ever seeing one with a serialized stock.
Sad part was, some of those rifles were perfect and with four, yes four, digit serial number receivers. All had been "de milled" with a tack weld at the barrel to receiver, and bores filled with lead. We had rifles from all manufacturers that ever made them. Almost made me cry to look at them.
"People live too long, dogs don't live long enough" - FTF Member-