(snip)
The MK6 was literally designed under SMU weight and length restrictions.
Had to be short enough for clip on IR/NV units.
Leupold was the only manufacturer that could meet the spec.MK6 is a complicated build.
Formey chiming in would be 24hr Gold.
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I'm going to disagree with the bolded statement above. While the MK5 maybe the one that Leupold produced to fit those specs, they are not the only manufacturer able to do that. Not by a long shot. They may be the only American manufacturer, but not the only one in the world.
I'm not sure why it's germane to say the MK6 is a complicated build, since we are talking about the Mark5 here.
For instance, March has a scope that is superior in almost every way compared to the Mk5 5-25X56. This scope is the March-FX 5-42X56. Right away, you see that it has a greater magnification range with an 8.2x zoom, compared to the 5x zoom the mk6,
The March-FX is 14.1 inches long compared to the 15.67 inch of the Mk5.
The March-FX is 33 oz compared to the 30oz of the Mk5, but is has features not found on the Mk5 than could be removed to lower the weight some, and 3 ounces is not "significant."
The March-FX has 140MOA of elevation adjustment compared to the 120MOA of the Mk5.
The March-FX has 14MIL of windage compared to the 17.5MIL of the Mk5.
The March-FX has a 26 degree eyepiece that provides 30% more FOV at any magnification compared to standard riflescopes like the Mk5. For instance at 100 yards @ 5X, the FOV for the March-FX is 26.19ft. At the same distance and setting the Mk5 has an FOV of 20.5 feet. This will be the same at all magnifications, well, up to 25X because that's where the MK5 stops while the March-FX keeps on going to 42X.
Now, Schmidt & Bender have introduce a similar scope the S&B 5-45X56 High Power. It's a little longer than the Mk5 at 17.1 inch and 39 ounces, so it's possible that's what you're thinking about.
I'm actually glad that the US Army has selected an American scope, but let's be real when talking about the competition.