I had an MG-34 parts kit years ago, sold by Golden Enterprises which had the street address of, surprise, surprise, Sarco. They also sold a solid cast aluminum dummy receiver for it. My FFL buddy and gunshop owner would set it up at the local shows and get a lot of attention. I still have the ammo can and two link belts sitting around here somewhere. It's possible that Sarco still has some of the dummy receivers for the MG-34. They seem to find forgotten old stuff in their warehouse every week.