NiteHog Viper 35 Flip to Side Adapter Picatinny. Press Release. Right Flip Black. Featuring a 39mm optical centerline this lightweight and secure mounting adapter ensures precise alignment with your day optical sight for optimal performance in diverse conditions. Features of NiteHog Viper 35 Flip to Side Adapter. Press Release. Right Flip Right Hand Flip Lightweight and Secure Precise Positioning Robust Press to Release Mechanism Package Contents: NiteHog Viper 35 Flip to Side Adapter. Press Release. Right Flip NiteHog NH003/M: Viper 35 Flip to Side Adapter Picatinny. Press Release. Right Flip Black