Sniper Tactical Polymer Front and Rear Combo Set For Picatinny Rails Tactical Polymer Front and Rear Rifle Sight Polymer construction, with Dual Aiming Apertures and holds Zero Precision Wind and Elevation Adjustments for Flexible Shooting Conditions Posi-Lock Design for Picatinny Rails Flip Up and use as Primary Sights, or Fold Down and use as Secondary Sights, Back Up Iron Sights