The ProMag PM202 M16 and AR-15 A2 rear sight can be used as a co-witness iron sight with most red dot and holographic sights or, as a stand-alone sight. Weighing in at just under two ounces, it features the standard military A2-style double peep aperture which allows for a known point of impact. The sight has full windage adjustment, one click of the windage knob provides approximately 0.48 MOA (minute of angle) change when mounted on the M16A2E4 rifle and about 0.65 MOA (minute of angle) on the M4 carbine. Initial zero is set by adjusting the weapons front sight post. The sight is low profile so that when in the down position, it will clear most optics. The sight base and body are molded from high strength, heat, and impact-resistant proprietary blended polymer. Precision molded to meet MIL-STD 1913 rail specifications. The sight is mounted to the rail via a locking bar and secured with a cross slotted, knurled thumb screw. Our special polymer formulation provides protection against high temperatures. The polymer is impact resistant thanks to a scientifically formulated compound providing superior strength. All steel components are black-phosphate per mil-spec. Brand: ProMag Model: Flip Up Materials: Polymer Color: Black Dimensions: 2 inches high x 1 inch wide x 1.5 inches deep Weight: .25 Before purchasing this product, please familiarize yourself with the appropriate state and local regulations by contacting your local police dept., legal counsel and/or attorney general's office. You, as the buyer, not Overstock.com, are responsible to understand your local, state, and federal laws before placing an order.

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