Leapers UTG Model 4 Low Profile Flip-up Front Sight for Handguard Features 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 Matte Black Hard Coat 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 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 Specifications Material Steel/Aluminum Rail Type Picatinny/Weaver Length 1.24 Width 1.30 Height 1.80 Leapers Inc. Model 4 Low Profile Flip-up Front Sight Model 4 Low Profile Flip-up Front Sight