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Customer Reviews
Helpful Positive Review
Fits Great by JoeF, Verified Owner, April 24, 2026
I installed this on the Canik Mete prine and it fits perfectly.
1/1 found this helpful
Helpful Positive Review
I mounted this on a 40 that I love taking to the range, and was impressed by how well this little optic did. My grouping and ease of acquisition was better, and this held up very well under the 200+ rounds I put through it.
1/1 found this helpful
Most Recent Reviews
Nice optic for a 43X MOS by Stan, Verified Owner, January 10, 2026
Fits the 43X MOS perfectly. Rubber cover does not fit, too loose and falls off. Needed to trim the rubber cover to make it fit better. Really nice Optic with a low profile so the factory iron sights can still be used.
Most Recent Reviews
Looks good by Stan, Verified Owner, January 2, 2026
It did not come with a battery and the rubber cover does not fit. Seems like the rubber cover is for a different, larger unit.
Most Recent Reviews
Awesome red dot by Deadeye, Verified Owner, October 8, 2025
Zero tech thrive hd pistol red dot is awesome. It was very easy to zero it in and easy to use. Excellent price, a great value.
Read All 5 Reviews
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Product Info for ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight

Introducing the Thrive HD Micro Reflex Optic (THDM21) a state-of-the-art addition to the ZeroTech range. This isnt just another optic on the market; it stands as a testament to ZeroTechs unwavering commitment to reliability, durability, and the incorporation of cutting-edge technology.image

Central to the Thrive HD Compact Reflex sight is its advanced shake awake technology. This feature ensures the optic is perpetually ready, eliminating any need for manual activation. Whether you find yourself in a high-pressure situation or are simply enjoying a day at the range, the Thrive HD guarantees its primed and ready to perform alongside you.

A significant highlight of the Thrive HD is its unmatched durability. Crafted to endure the most challenging conditions, the THDM21 being recoil-proof, waterproof, and fog-proof. Come rain, fog, or rugged terrains, the Thrive HD remains steadfast in its performance.

With its design based on the RMSc footprint, the Thrive HD Micro Reflex integrates effortlessly with all RMSc compatible firearms and mount interfaces. This ensures users benefit from a broad spectrum of compatibility options, further accentuating the optics adaptability.

WARNING: California`s Proposition 65

Specifications for ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight:

Manufacturer: ZeroTech Optics
Color: Black
Magnification: 1 x
Objective Lens Diameter: 21 mm
Emitter Type: Open
Operating Temperature: -20 - 70 Celsius
Condition: New
Red Dot Sights-Footprint: RMSc

Features of ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight

  • Up to 150,000 hours battery life
  • Shield RMSc footprint
  • Weighs only 19 grams (0.67oz)
  • Moulded rubber cover
  • Auto shutoff and Auto ON
  • Adjustable brightness
  • Guaranteed Waterproof and Shock proof
  • AR lens coating specially developed for the least possible image distortion

Package Contents:

  • ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight

ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight Orderable Models

List of Orderable Models

  • ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight, 3MOA GREEN DOT Reticle, Black, THDM21G , MPN: THDM21G , UPC: 9334046005561 , Code: 4TM-RD-ZTOR3-THDM21G
  • ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight, Multi Reticle, Black, THDMM21 , MPN: THDMM21 , UPC: 9334046005585 , Code: 4TM-RD-ZTOR3-THDMM21

ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight Unavailable & Discontinued Models

List of Unorderable Models

  • DEMO, ZeroTech Optics Thrive HD Series RMSc Footprint 1x21mm Micro Reflex Red Dot Sight, Multi Reticle, Black, THDMM21 , MPN: THDMM21-DEMO , Code: 4TM-RD-ZTOR3-THDMM21-DEMO
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