FLIP-UP BATTLE SIGHTS LMT's L8BUIST is the perfect backup solution for users whose primary sighting system is a red dot or variable power optic. The L8JT rear sight features windage only adjustments and flip apertures for simplicity. These bomb proof sights from LMT Defense feature a low-profile design and are compatible with both 5.56 and 7.62 caliber rifles. Steel construction will ensure longevity and readiness when you require a backup sighting system. Mfg: Lmt Defense