I stopped by a local gun store last month to look over any old milsurps they may have. Didn't see anything at first, then noticed an M1 carbine in a commercial sporter type stock. Asked to look at it and noticed it was a Winchester, and the was a letter stapled to the price tag. It was a consignment piece.
The letter basically said that the rifle was carried by the owner in his L-19 aircraft on every flight he made while in country, and that he had a local Viet carve him a short two hand grip stock for the carbine so that it would fit inside the L-19 cockpit easier.
I know, buy the gun