Depending on what you're looking for, Ordnance Research might be able to help you out. We have some Grade "B" dummy guns that I built using some of our left over parts. The gun has no guts or sights but the rear sight bracket is present. We generally sell these to vehicle guys that are only really looking for a vehicle accessory. If memory serves me right, we have a couple that are almost ready to go. We just need to make dummy barrels for them.
If you're looking for a better grade gun with a bolt that will run back and forth, that might be possible too. But, either way, you'll need to call and talk to Curt Wolf @ 717.738.6941 M-F 9-5. He's the boss. I'm just one of the "elves"