NiteHog Viper 35 Flip to Side Adapter Picatinny. Press Release. Left 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. Left Flip Left Hand Flip Lightweight and Secure Precise Positioning Robust Press to Release Mechanis Package Contents: NiteHog Viper 35 Flip to Side Adapter. Press Release. Left Flip NiteHog NH003/ML: Viper 35 Flip to Side Adapter Picatinny. Press Release. Left Flip Black