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Thread: Eotech Overheating?

  1. #1
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    Eotech Overheating?

    Has anyone experienced an overheat issue on a EoTech EXPS3?

    Shooting a competition the other day and my reticle was so faded that I though the optic was turned off.
    Replaced the battery and no change. I put my hand on the front of the optic and it was barley visible. Tuning it off and on had no effect.
    Swapped it out with another EXPS3 (new version) that was in my SUV and finished shooting the competition.

    On the drive home I decided to hold my older EXPS in front of my a/c vent and behold....the sight became brighter.

    I knew the older version of this optic had a recall for thermal drift but I am not aware of an overheat issue.

  2. #2
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    Thermal drift is ONE of many problems with Fail tech sights. Reticle fade as you experienced was and is common and is attributed to high heat. Moisture incursion still occurs and will do the same thing. Cold weather distortion, where the reticle appears to grow and/or distort in appearance as the ambient temperature falls. parasitic battery drain.

    Here's some tidbits from the lawsuit deposition.

    64. In other words, even at 32 degrees Fahrenheit, the sight’s accuracy varied by 12
    inches per 100 yards, and at 5 degrees, the sight’s accuracy varied by more than 20 inches per 100
    yards.

    65. When questioned about EOTech’s cold temperature testing, the CTO testified that
    when EOTech testers took the sights out of the cold temperature chamber, “instantly, they fogged
    up.” As a result, he explained, they had to wait until the sights warmed up to test them,
    acknowledging that the sights were thus “not at minus 40 anymore at that point. . . . [T]hey should
    have known better, but that’s what they did.” In other words, the testing that EOTech conducted
    was not at -40 degrees.

    107. In August of 2009, the same laboratory conducted an internal vapor analysis on six
    sights, specifically those in use by the U.S. Special Operations Command operators, to determine
    whether the sights leaked the nitrogen gas that was injected into the sights to keep out moisture.
    The laboratory concluded that all of the sights in the sample leaked nitrogen. When EOTech then
    asked the laboratory to conduct additional testing to assess the rate and the path of the leaks, the
    laboratory reported that it was unable to complete the testing because the “[l]eak rate was greater
    than the instruments’ detection limit.”
    108. An EOTech test engineer subsequently prepared a single-page summary of the
    results, reporting that two “Significant Findings” of the testing were that “[n]itrogen & moisture
    content reach[] near ambient levels within a 1 month period” and that the use of a “[d]essicant [sic]
    provides a significant improvement to moisture content but only for a short period of time (< 1
    month).” According to a former EOTech optics engineer, all of the senior managers were aware
    of the results, including Mangano.

    For the whole read, and it's worth the read follow the link below.

    https://soldiersystems.net/wp-conten...Inc.-et-al.pdf

  3. #3
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    I have not experienced that. I’ve used Eotechs in some hot places on 3 continents. Doesn’t mean it can’t happen, I suppose.

    Mysteryman, thanks for not answering his question, at all, in any way.
    RLTW

    Former Action Guy
    Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.

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    Quote Originally Posted by 1168 View Post
    I have not experienced that. I’ve used Eotechs in some hot places on 3 continents. Doesn’t mean it can’t happen, I suppose.

    Mysteryman, thanks for not answering his question, at all, in any way.
    I think the answer is very clear. EOTech optics are dogshit, have a history of failing due to heat and cold, have no effective seal preventing moisture or dust from entering, can't hold zero, eat batteries, and are oversized and priced for what you get.

  5. #5
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    I forwarded this to a friend whose kid just hired into QC at the "new" (post-L3) Eotech, sounds like the kid's gonna try to look into this.
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  6. #6
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    Quote Originally Posted by Mysteryman View Post
    I think the answer is very clear. EOTech optics are dogshit, have a history of failing due to heat and cold, have no effective seal preventing moisture or dust from entering, can't hold zero, eat batteries, and are oversized and priced for what you get.
    That certainly explains why military SOF keeps buying them and using them all over the globe, to this day.

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    Quote Originally Posted by Mysteryman View Post
    I think the answer is very clear. EOTech optics are dogshit, have a history of failing due to heat and cold, have no effective seal preventing moisture or dust from entering, can't hold zero, eat batteries, and are oversized and priced for what you get.
    That post is complete bullshit. They certainly had issues but are in continued use with happy customers that train and operate in the most extreme environments around the globe. They’re definitely not perfect and Aimpoint has some advantages so it’s certainly mission and user dependent but I just conducted several weeks of desert training with guys that had T2s and about half of them were jealous of my EXPS 3, despite previous “heard of” issues.


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    The issue lies on when that defective EXPS3 was made...

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    Quote Originally Posted by 1168 View Post
    That certainly explains why military SOF keeps buying them and using them all over the globe, to this day.
    Do you believe the government makes the best decisions all the time? Do you see the recent stellar decision in the media? Don't forget who's using them and for what. At short range it works, and if it doesn't then the service member gets another one. Easy to sing the praises of something you don't buy and appears to work for your intended role. Overall, they're dogshit compared to Aimpoint or Trijicon offerings.

    Quote Originally Posted by Wake27 View Post
    That post is complete bullshit. They certainly had issues but are in continued use with happy customers that train and operate in the most extreme environments around the globe. They’re definitely not perfect and Aimpoint has some advantages so it’s certainly mission and user dependent but I just conducted several weeks of desert training with guys that had T2s and about half of them were jealous of my EXPS 3, despite previous “heard of” issues.


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    Yes, because all service members are well informed and switched on gear/gun guys. Lusting after shit means absolutely nothing, especially when credibility is involved.

  10. #10
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    Quote Originally Posted by Mysteryman View Post
    Do you believe the government makes the best decisions all the time? Do you see the recent stellar decision in the media? Don't forget who's using them and for what. At short range it works, and if it doesn't then the service member gets another one. Easy to sing the praises of something you don't buy and appears to work for your intended role. Overall, they're dogshit compared to Aimpoint or Trijicon offerings.



    Yes, because all service members are well informed and switched on gear/gun guys. Lusting after shit means absolutely nothing, especially when credibility is involved.
    I’m aware that most soldiers don’t know shit about guns but I’m not talking about them.


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