The Theta Optics Open II Reflex Sight Replica is an open reflex optic designed for fast target acquisition and a clean sight picture on standard 22 mm rails. It is a compact and practical replica with selectable red or green dot, vertical and horizontal adjustment, and multiple brightness levels to suit different operating conditions. The design focuses on simplicity, speed, and ease of use, making it a solid choice for anyone looking for a straightforward and reliable reflex sight.

Technical details

• Brand: Theta Optics.
• Product code: THO 10 009053.
• Weight: 220 g.
• Dot color: red and green.
• Adjustment: vertical and horizontal.
• Power supply: three LR44 batteries, not included.
• Mounting: standard 22 mm RIS rail.
• Aimpoints available: four.
• Brightness: multiple levels available.

Package contents

• Reflex sight.
• Hex keys.
• User manual.
• Cleaning cloth.

How to use

• Mount the optic on a properly tightened 22 mm rail.
• Install three LR44 batteries, observing polarity, since they are not included.
• Choose the red or green dot according to light conditions and personal preference.
• Adjust windage and elevation until the sight is zeroed.
• After use, switch the optic off and store it in a dry place.

Safety warnings

• Do not use the product as personal protective equipment.
• Do not tamper with the electronics or the housing.
• Periodically check mount tightness.
• Keep out of reach of children.
• Avoid impacts, drops, and improper use.
• Remove the batteries during long storage periods.
• Store away from moisture and heat sources.