The PM202 AR-15 / M16 Polymer Flip Up A2 Dual Aperture Rear Sight may be used as a co-witness iron sight with most red dot and holographic sights, or use as a stand-alone sight. Weighing in at just less than two ounces, it features the standard military A2-style double peep aperture, which allows for a known point of impact. The PM202 sight is fully adjustable for windage. The sight stem and body are molded from high strength, heat, and impact-resistant proprietary blended polymer. All steel sight components are CNC machined, then black phosphated per mil-spec. The sight is precision molded to fit AR-15 / M16 flat top A3 upper receiver rifles, carbines meeting MIL-STD 1913 Picatinny rail specifications. The sight is mounts to Picatinny rails via a locking bar and secured with a cross slotted, knurled thumb screw. The PM202 may be paired with PM138, PM209 and PM210 front sights. No permanent modification is required, all hardware is included.- Co-witness most red dot and holographic sights, or use as a stand-alone rear sight- Features the standard military A2-style double peep aperture- Precision molded to fit AR-15 / M16 flat top A3 upper receiver rifles, carbines and MIL-STD 1913 Picatinny rails- Mounts to rails via a steel locking bar and secured with a cross slotted, knurled thumb screw- Molded from high strength, heat, and impact-resistant proprietary blended polymer- Fully Adjustable for windage - No permanent modification required, all hardware is included