Winchester Enters The Thermal Market

Published on December 7, 2025
Duration: 10:34

This review covers the Winchester THSX 640 Thermal Hunting Sight, highlighting its 640x512 sensor, <30mK sensitivity, and 12-micron pixel density. The reviewer, Kyle from 4MR Ranch, conducted a 90-day test on a 5.56 platform, focusing on zero retention and durability, including surviving a truck drop. The THSX 640 is presented as a capable, albeit basic, entry into the thermal market with solid core performance.

Quick Summary

The Winchester THSX 640 Thermal Hunting Sight boasts a 640x512 sensor with <30mK sensitivity and 12-micron pixels. Tested over 90 days on a 5.56 rifle, it showed excellent zero retention and durability, even surviving a truck drop.

Chapters

  1. 00:00Introduction & Disclosure
  2. 01:05Technical Specifications
  3. 01:37Testing Methodology
  4. 02:44Zero Retention Testing
  5. 05:16Durability & Drop Test
  6. 06:26Power & Battery Life
  7. 07:08User Interface & Accessories
  8. 08:20Video Footage Issues
  9. 09:04Final Verdict

Frequently Asked Questions

What are the key technical specifications of the Winchester THSX 640 Thermal Hunting Sight?

The THSX 640 features a 640x512 sensor resolution with a 12-micron pixel density and a thermal sensitivity of less than 30 millikelvin. It is powered by two common 18650 batteries.

How does the Winchester THSX 640 perform in terms of zero retention?

During a 90-day test on a 5.56 platform, the THSX 640 demonstrated reliable zero retention, maintaining accuracy for hog hunting at distances up to 200 yards.

Is the Winchester THSX 640 durable enough for field use?

Yes, the optic survived an accidental drop from a truck onto concrete. While it required re-zeroing, the unit remained functional, indicating good resilience for hunting scenarios.

What are the potential drawbacks of the Winchester THSX 640?

Some users may experience video file compression issues requiring third-party software for viewing. Additionally, the initial charging cable was data-transfer limited, though Winchester has updated this.

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