Theta Optics Spider Red / Green Dot Sight for 20mm RIS / RAS Rails

Theta Optics
Code: THO-10-011603
  • Multiple Reticule Types
  • Red / Green Modes
  • Tool-less Fitting

An Airsoft Red dot sight created by THETA OPTICS which is designed to be quickly and easily fit onto 20mm RIS / RAS Rails to make aiming your rifle or pistol easier and quicker. The sight projects a sight picture / reticule on to the front glass lens which once zeroed will be where the weapon will shoot no matter the angle at which you can see the picture, this allows you to acquire targets quicker and more efficiently giving you an edge in an Airsoft game. 

The sight picture can be adjusted to one of four types, including a dot, circle, and two cross types, and can be adjusted to show in either red or green.

This sight is perfect for any Airsoft Skirmisher who is looking to improve their CQB game-play by allowing them to acquire targets faster and easier than their opponents on iron sights.

Full description


The sight is constructed from alloy, and features a bright and clear picture, and can be fully adjusted for windage and elevation. The dot is powered by three LR41 battery, which can be commonly purchased from almost any super market or battery store.


  • Adjustable Windage
  • Adjustable Elevation
  • Multiple Reticule Types
  • Powered by 3x LR41 Button Battery
  • Red and Green Illumination Modes
  • Clear Sight Picture
  • Tool-less fitting 
  • Clamp mount
  • Branded:
    • 'UP'
    • 'BATTERY +'
    • 'ON RED'
    • 'ON GREEN
    • 'OFF'
    • 'R'

Package Includes

  • Spider Red / Green Dot Sight for 20mm RIS / RAS Rails
  • Instruction Manual
  • LR41 Button Battery x3
  • Lens cleaning cloth
  • Allen Keys

Special Instructions

To turn the sight off press both the ON RED and ON GREEN buttons at the same time.



Parts & Accessories Type
Sights and Scopes
Sight Type Icon
Sight Type
Red Dot Sight
Package Includes
Instruction Manual, Cleaning Cloth, Allen Keys, LR41 Button Battery,

Weight and Dimension

Product Height
Approx. 5.5cm
Product Length
Approx. 8.3cm
Product Width
Approx. 4cm
Weight KG Icon
Weight (KG)
Approx. 0.142kg


Colour Wheel Greyscale
Item Colour
Construction Icon
Full alloy construction, with glass lens

Sight Specific

Sight Magnification
Sight Adjustment Adjustments
Windage, Elevation, Multiple Reticle Types,
Sight Zero Adjuster Method
Hex / Allen Key
Sight Zero Location
Top, Left,
Sight Mount Options
20mm RIS / RAS Rail
Sight Objective Lens Diameter
Reticle Type
Multiple Reticle Types

Illuminated Sight Specific

Illuminated Reticle
Illuminated Reticle Levels
Illuminated Reticle Colours
Red, Green,
Battery Type