Green Blob Outdoors ( Dark Earth / Tan ) Tactical Low Profile, Polymer, Flip up Front & Rear Sights, Picatinny Rail Mount 223, 5.56. Ar &hellip; Creates a precise optical tunnel that ensures more accurate aiming and faster target acquisition For Flat Top Picatinny Rails HK Rear & Front Flip Up Folding Sight Set Tactical Back-Up Sights Fit virtually all Picatinny rails; for same plane rail applications