Theta TO551 Red Dot — Tan

The Theta TO551 is a compact red/green dot sight with a holographic-inspired profile, designed for use on rifles and carbines with a 22 mm Picatinny or RIS rail. It is aimed at shooters who need fast target acquisition in a low-profile package, both in full daylight and at dusk.

The reticle can be switched between red and green illumination, with multiple adjustable brightness levels: the ability to dim the dot to its lowest settings makes the TO551 usable indoors or in low-light conditions without washing out the shooter's vision, while the higher settings maintain visibility in direct sunlight. There is no dedicated NV mode, so compatibility with night-vision intensifiers should be assessed carefully.

Windage and elevation are adjusted mechanically, allowing the point of impact to be zeroed on both axes. Power comes from four LR44 batteries included in the box — a widely available format, though managing four cells rather than a single CR2032 means carrying more spares.

Key features

• Switchable red/green reticle with multiple brightness levels: adaptable from direct sunlight to low-light environments.
• Compatible with 22 mm Picatinny/RIS rails, no adapters needed on standard platforms.
• Mechanical windage and elevation adjustment to zero the dot against the point of impact.
• Compact holographic-profile design that keeps rail space free for other accessories.
• Powered by included LR44 batteries: readily available on the civilian market.

In the box

• Theta TO551 sight
• 4 × LR44 batteries