Size comparison: USO ST-10 & ER-25

Discussion in 'Optics and Tactical Gear' started by spamassassin, Apr 11, 2016.

  1. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
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    I've got them both mounted so I figured I'd snap a pic. Partly for insurance, partly for dyeing eyes green.

    At left is a 24" savage 10fpsr with USO ER-25 5-25x58 with 4" sunshade/ARD.
    At right is a 24" mossberg MVP varmint with USO ST-10.
    Yes rings are a little tall but they work with the tall cheek rests.

    The ER-25 is about 2.5lbs, almost 3 with the sunshade and over 3 with the rings. The ST-10 is 1.5lbs and the rings are about 3 ounces.

    [IMG]

    Boy oh boy are those clear and bright. Nothing quite like perfect glass.
  2. Keith Moderator

    Member Since:
    Dec 7, 2014
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    Nice looking set of rifles!
  3. tevan0707 Member

    Member Since:
    Feb 27, 2015
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    Very nice! I hope to one day have US optics on my rifles!
  4. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
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    USO is awesome glass but you really want to know a few things before jumping into that brand. Some people don't dig on the idiosyncrasies in their variable line. With the ST-10 it's just like any other fixed power scope and the odder things don't actually appear because they're related to how variables work. Other than being pretty fabulously heavy for a 10x37mm it's completely lacking in idiosyncrasies. In the variables because they don't use a mask you get some tunneling at low mag and a touch of vignetting at high mags when at the extremes of adjustment. There are engineering reasons that they don't include a mask which would eliminate those effects. So far experimenting with the 5-25x, as I expected, as it's meant for extremely long ranges and doesn't fully hit its optical perfection until I've got 6-7mils of elevation dialed in off the bottom. Before that there's a tiny bit of vignetting at the top at 25x.

    I don't use USO because they're the best scope for optical performance. For that I'd probably go Hensoldt or S&B. I prefer USO for a lot of reasons. Because they're a California company, they know how to treat customers, they employ mostly veterans, when I bash one of their optics into a barricade or my rifle just falls over I still have a functioning scope and the zero isn't shifted, the EREK knob is awesome and low profile and they make just incredibly clear optics.

    I had to RMA my ER-25 for some minor stuff first thing and in the box when it came back (after only 2 weeks) was a hand written apology along with the usual swag. That was pretty classy.
  5. tevan0707 Member

    Member Since:
    Feb 27, 2015
    Message Count:
    81
    That's good to know. I will never get to the point of using a USO optic, I like to think I can but I'm sure the "best" I will get to is a Razor HD Gen 2. Having never looked through a USO, I can only go off of other people's reviews but I don't think I have ever heard a bad thing about them. I only know of one of my buddies that prefers nightforce over USO.

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