16 1/2" Lightning pistol stock

There has been talk about AMT experimenting with a folding stock they would market with the 16 1/2" Lightning barrel. I had never seen anything like that until just recently.

This one is not a folder and is not marked anywhere. The design and execution is amazing. You can't really tell from the pics that although it is fairly simple, it is very well done, including the bluing. It mounts neatly with little tolerance using the grip screws. Also great on the shoulder, with the sights lining up perfectly with my eye. The plastic butt has not been modified, except probably for length. At what would be the tang and grip area it is very slim, like a BB gun. I can't figure out where it would come from if it came from a donor stock/gun. My gut feeling is that it is an AMT prototype. Why else would they make the 16 1/2" barrel?

 It actually didn't come on this frame. I got just the barrel and stock together and put them together with a frame that I had. 

There are a few 16 1/2" Lightnings out there but very few are on a Lightning frame. Many are on Ruger frames. Actually, most I've seen were barrel/receiver only. There is no marketing material for them. I've always wondered what the point was of in making the 16 1/2", it's really quite clumsy as a pistol. This stock seems to be the missing link

 Was that the same guy who marked about 100 Lightning with the serial numbers starting with AMTL? I think he was out of Montana or Wyoming