Meprolight FUBS Flip-Up Backup Sights (Two Rear Lamps, Black)

Equally useful as primary sights, the FUBS Flip-Up Backup Sights from Meprolight mount easily on your rifle's Picatinny rail and provide glowing tritium lamps for confident aiming. The two lamps in the rear sight and the one in the front are always on, require no batteries, and are rated to last 12 years. The front sight can be adjusted for elevation with its finger-operable dial; windage adjusts on the rear side with a screwdriver or coin.