[Ron Wood]

Somebody screwed-up and it is a shame. That is a pretty nice looking First Issue with a neat unit mark. They aren't easy to come by.
By the way, simple possession is a problem but most likely would not be vigorously enforced unless there was some other factor involved. If you own a Luger stock and do not have the corresponding type Luger to go with it, possession of both items can be considered "intent" to create a short barreled rifle whether or not the stock is ever actually installed on the gun. A fine point, and as I said probably not likely to be pursued, but it is indeed a potential problem. Glad you swapped it for a can of ammo.