NcStar AR15 Flip Up Front Sight Black

Features:AR-15 Flip-Up Front Sight - Back-Up Iron SightDesigned to be Mounted on Top of Gas Blocks with Picatinny Rails lower than the AR15 Receiver RailFlip-Up A2 Front Sight Post folds down out of view of your optics when not in useThe A2 front sight post is fully adjustable for elevationAluminum and Steel ConstructionLength: 1.2" (extended), 2.1" (folded)Weight: 3.4 oz