looks to be typical harbor freight type stamps on the receiver. But, after a certain date all importers were forced to add # to the receiver . Looks to be a typical depot build on a bnz marked Astrawerke receiver.
That one’s been around the block a few times. I think at one point it was owned by a member here and it’s been posted by several people over the years as can be found on Google. Seems to pop up every few years