Williams Gun Sight Blackout Picatinny Rail Folding Sight Rear Black. The patent pending tri-optic technology allows for accuracy in low light conditions and extreme darkness without sacrificing any of the red dot sights features. The tri-optic technology allows for compact sight picture and improves target acquisition speed and accuracy. Machined from aircraft quality aluminum with the strength you have come to expect from Williams Patented Tri-OpticTM Rear sight. Features a patent pending tri-optic technology with multiple diameters to choose from. Able to be mounted on any flat top Picatinny rail. When you need a rear sight that will really perform choose the Williams Patented Tri-Optic Rear sight. Specifications for Williams Gun Sight Blackout Picatinny Rail Rear Folding Sight: Manufacturer: Williams Gun Sight Front Sight Color: Black Rear Sight Color: Black Color: Black Fabric/Material: Metal Front Material: Metal Attachment Type: Screw Gun Type: Rifle Weather Resistance: Yes Package Contents: Williams Gun Sight Blackout Picatinny Rail Rear Folding Sight Williams Gun Sight 642967: Blackout Picatinny Rail Folding Sight Rear Black