Moar video:
http://www.youtube.com/watch?feature=player_embedded&v=lyhxHs3n0Y0
The original prototypes are worth BIG money:
Documented Extremely Rare Colt Experimental 1911A1 Prototype Fully Automatic Government Model Pistol with Shoulder Stock from Colt Factory Collection
Or how 'bout one in .38 Super?
Documented Extremely Rare Experimental Prototype Colt Fully Automatic 38 Super Pistol Carbine with Stock Used in F.B.I. Trials From The Colt Factory Collection