Look what I found, no I'm not going to bid , I'm broke

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=372035116

I could be wrong, but isn't that barrel technically a DD all by itself?

Damn! That's not cheap

Morg, I believe you can have the barrel by itself, or the receiver by its self, but not both without paperwork.  The likelihood of having/finding an xm148 receiver is somewhere just south of nil.   I have been gatthering pics and info though, along with a nutter retrohead, to see what we can come up with.
There was an xm148 sight, along with it's carrying case on GB the other night. It sold for 195 dollars.

I've seen complete barrel assemblies recently. I didn't ask how much they were going for. Wish I had, then I'd know if this was worth bidding on.

I'm getting together some reference to start plotting out receiver dimensions. If I knew for certain which organization was holding onto the blue prints, if they're available, it could be a much simpler task.