We will ship this adapters by envelope mail if only circular mode adapters is ordered. This is for HRS-31 Basic, HRS-31 Raven Standard. It is NO useful for HRS-31 pro.

• - Pros: Offer a circular view experience same as tube night vision, no need to adjust screen leveling anymore
• - Cons: Loose about 4 degrees field of view within 3 meters
• - Works on all HRS-31 Basic and Raven Standard devices
• - Only takes 1 minute to install
• - Material: ABS Styrene
• - Laser cut to ensure precision