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Posted: 12/31/2004 11:58:21 AM EDT
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if you zero to 50 yards, that should give you a 200 meter zero, regardless of optic or sight or aperture. this is just due to bullet drop, it's a coincidence that the 50 yard zero point coincides with the 200 meter zero point. as far as using a2 sights, I think the large aperture is a different height when raised then the small aperture, so to get the same zero you need to adjust elevation. for instance, on my m4gery, I use the IBZ to zero the sights for 50 yards. if I wanted to switch to the large apeture, I would have to raise the elevation to 300 yards to get the same POI. correct me if I'm wrong, someone. 
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I don't know what zero range you get for the other aperture for the same elevation, I think you need to raise the elevation to get the same zero by 2 clicks for a 1 moa sight. |
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On an A2 rear flip aperture, there are two apertures: the large "ghost ring" and the smaller "long-range" aperture. These apertures are at different heights, with the small hole's center being slightly higher than the large hole. The way the are supposed to work is that the rifle is normally used with the large aperture, which should be zeroed at 50 yards, giving an approximate 200m zero, with a very flat trajectory out to 250m or so. No elevation (turning of the A2 elevation dial) should be used with the large aperture. For shooting at 300m and beyond, the shooter flips to the small aperture, which has a different zero, being centered higher. In the 8/3 (or 6/3 setting for a detachable carry handle), the small aperture should be on at 300m. Shooting beyond this distance requires adjusting the elevation knob to match the distance. In other words, to shoot at a target 500m distant, turn the elevation wheel to "5" while using the small aperture. With a BUIS that has no elevation adjustment, the A2 aperture works the same way, except that you are limited to shooting at 300m (or using hold-overs for longer distances). Given that BUISs are emergency back-up sights, this limitation is rarely an issue. The large aperture is used by default, as most threats will be those at close range (200m and less). So, zero using the LARGE aperture at 50 yards (or at 200m, if you have such a range available), and you are good to go. -Troy |
Troy, I can't tell you how much I appreciate the knowlege you impart on these forums.. Thank you! Dave |
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