USGI M203 Quadrant Sight - Used

These are used sights meant to be mounted to a fixed carry handle upper.  The knobs of the detachable carry handles interfere with the declination adjustment.  You could still mount it just for the vibe I suppose.

Quantities are extremely limited, as well as the applicable use case for these sights -- but don't let that or the cost deter your efforts to collect paraphernalia from your glory days of the GWOT!