Set of as-new BUIS. DPMS steel detachable front sight attaches to Weaver or Picatinny gas blocks or front sight bases. Skeletonized center enables sling attachments, sight post adjusts for elevation. Rear sight is Matech AR-15/M16 flip-up sight with fast, easy range setting. Current standard issue back-up rear sight for M4 carbines and M16A4 rifles. Detent-locking lever for quick switch to one of eight range setting: 200, 300, 350, 400, 450, 500, 550, and 600 meters. Trade for .22 rifle of equal value, or 10mm, 7.62x39 or 9mm Makarov re-loadable ammo. $129.95 Cash.