Yankee Hill Same Plane Flip Front Sight Sight Picatinny, Black YHM-9627 This Durable, All Steel Sight Mounts On The Same Plane as The Rear Sight To Give You a Backup Iron Sight. The Sight Folds Out Of The Sight Line With The Push Of a Button And flips And Locks In The deployed Position With Ease. Mounts quickly And Easily With The Included Thumb Screw. Accepts All Standard AR Sight posts And Hardware (Included).