Leapers Low Profile Flip-Up Front Sight is constructed of aluminum with a anodize black finish. It has a Posi-lock and a low profile 3mm locking bolt and mounting deck. Features: UTG new gen super slim flip-up front sight for the AR platform and other long gun applications equipped with Picatinny rail Precision machined from aircraft grade aluminum with black anodize Spring loaded posi-lock design with side plunger release for positive flipping/folding; compress plunger to unlock and fold down when not in use Robust posi-lock plunger coupled with spring activated ball bearing guarantees zero retention Front sight post is elevation adjustable with standard 4-prong front sight adjustment tool Low profile 3mm locking bolt and mounting deck securely attaches to any Picatinny rail Designed to match MNT-955 new gen super slim flip-up rear sight on same level plane applications, either directly on handguard or on a high profile Picatinny rail gas block