Troy Top Mounted Deployable Rear Sight for AR-15 Black. Like all tritium night sights they are powered by a form of hydrogen that emits a continuous light source where using batteries or electricity is not possible. target acquisition is made possible in low or no light conditions. These Troy Battle Sights are designed to work on same plane rail systems only. Will not work with a railed gasblock that is higher or lower than the receiver. We offer complete line of Troy Tritium & Fiber Optic Night Sights. For our complete selection of products by Troy Industries on sale please visit our Troy Industries page. For more Tritium & Fiber Optic Night Sights please visit our Tritium & Fiber Optic Night Sights store section. Specifications for Troy Top Mounted Deployable Iron Sight for AR-15: Manufacturer: Troy Color: Black Condition: New Sight Mounting Orientation: Top Mounted Sight Position: Rear Gun Model: AR-15 Rear Sight Color: Black Deployable: Yes Hand: Ambidextrous Mount Type: Picatinny Country of Origin: USA Attachment Type: Picatinny Features of Troy Rear Tritium Folding Battle Sight: No limited sight orientation due to low light conditions Front post is centered between two tritium points of reference to allow for proper alignment Easy installation Package Contents: Troy Rear Tritium Folding Battle Sight What firearm models does the manufacturer say Troy Top Mounted Deployable Iron Sight for AR-15 is compatible with? The manufacturer suggests that Troy Top Mounted Deployable Iron Sight for AR-15 is compatible with AR-15Troy SSIG-FBS-RTBT-00: Top Mounted Deployable Rear Sight for AR-15 Black