Exc. cond. PS90 Secret Service black ring of death sight. This sight is all metal and not cheap plastic like most of the ring sights. These have never been available to the public but pop up ever so often. I had saved this for a SBR project that never happen, needing a couple of quality rifle red dot optics and would consider a trade, Vortex UH-1, Aimpoint etc. Let me know what you have.