The low-profile Leapers UTG Model 4 Flip-up Front Sight Replacement is designed to mount on your top Picatinny rail. These AR 15 Iron Sights from Leapers are made from precision machined aircraft grade aluminum with an anodized finish. These Leapers UTG Model 4 Low Profile Front Sight Replacements flip up or down and have a Posi-Lock design that keeps them where you put them, which ensures zero retention. Upgrade your sighting options with the Leapers UTG Model 4 Low Profile Flip-up Front Gun Sight.