Ultradyne UD Picatinny Chassis Bridge OD Green. This provides a strong interface that positions the Picatinny rail of the bridge at the right height for mounting most night vision devices. The UD Picatinny Bridge is an essential component for shooters who use night vision and want to securely attach it to their UD Picatinny Chassis. Specifications for Ultradyne UD Picatinny Chassis Bridge: Manufacturer: Ultradyne Fabric/Material: 6061-T6 Aluminum Length: 3.9 in Width: 1.9 in Height: 2.1 in Weight: 5.4 oz Features of Ultradyne UD Picatinny Chassis Bridge Aligns with receiver Picatinny MLOK hardware included Removeable top for barrel removal Package Contents: Ultradyne UD Picatinny Chassis Bridge Installation Hardware Included Ultradyne UD20178-OG: UD Picatinny Chassis Bridge OD Green