Meprolight

The Mepro FRBS/FUBS/FABS tritium sights are flip-up night sights built to be used as both your primary sights or as backup sights in place of your optic. - A low-profile durable flip-up sight built to fold up and stay exactly where you need them until you no longer need them. Quickly adjust set and forget the sight pin elevation without tools. Day or night these iron sights are drop- and shockproof and built for endless rounds of heavy recoil to keep you in the fight. - Low profile and lightweight design - Can be used as a primary or back-up sight - Manually adjustable no tools needed - Durable fiberglass reinforced polymer and metal construction - Spring-based locking mechanism will not break or deform - Compatible with all MIL-STD 1913 Picatinny rails - 12 years warranty for Night Sight luminance