My brother gave me this 586-1. It appears to be well used but well cared for. It has silhouette front sight which I imagine is not too common. Since the 586 has a full underlug, why would someone add this massive underlug weight? It is extremely heavy which, to me, would be worse that the amount of reduced muzzle flip it might prevent. No markings, but two set screws underneath. I will be removing, but am fearful of scratched bluing. Sorry, not sure why the pics are upside down.