Tactical Automatic Button Quick Deploy Black Color Front & Rear Flip Push Backup Polymer BUIS Aiming Sights Same plane iron sights are constructed of polymer for durability. The front sight has an adjustable A2 post and a ball bearing pivot detent with posi-lock design that automatically locks into place to guarantee zero when raised . The rear sight is adjustable for windage and has two apertures. Automatic Flip-Up Quick Deploy Front and Rear BUIS Aiming Polymer Sight Rugged polymer Construction - Both Sights Sits At The Same Height plane HEAVY DUTY POLYMER, ABSOLUTELY NO WOBBLE Can not be exported!