What exactly is that mechanism on the front right side of that worn Colt (I believe?) revolver?
It's a semi-automatic 22 revolver Colt experimental prototype.
the barrel moves when the gun is fired, it in turn moves the lever as shown on the side of the gun, that in turn rotates the cylinder.
Yes, it's a one of a kind and it came from Colt with a factory letter stating just that.
It was made in the late 50's
Pictures of some of my junk
The "Flame Thrower" has a pretty unique look, any story or particular purpose behind the modifications?
Question - did you ever test fire that 22 semi-auto revolver?