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Posted: 8/16/2017 8:03:58 PM EDT
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[I initially zeroed my A2 at 3/8 for 300 yards. A couple weeks agi i decided to rezero with a 50 yard zero.
My first zero was within 4 clicks of mechanical zero. The new zero had me running the rear sight damn near all the way to the left. What changed here? Why would this happen? |
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Quoted:
[I initially zeroed my A2 at 3/8 for 300 yards. A couple weeks agi i decided to rezero with a 50 yard zero. My first zero was within 4 clicks of mechanical zero. The new zero had me running the rear sight damn near all the way to the left. What changed here? Why would this happen? |
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For a 20" A2, I don't see how the RBIZ is any better than how we did things in the Corps.
The rear sights were 8/3 -2 (3 down bottomed out). Initial zero was shot at 25yds for group, rear sight set at 8/3, and then verified at the 300yd line. Then 8/3-2 with the small aperture was your 200yd setting. For under 200, and in low light, you use the large aperture. I assume that the army uses 8/3 as their base and use the large aperture for under 300 |
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Quoted:
For a 20" A2, I don't see how the RBIZ is any better than how we did things in the Corps. The rear sights were 8/3 -2 (3 down bottomed out). Initial zero was shot at 25yds for group, rear sight set at 8/3, and then verified at the 300yd line. Then 8/3-2 with the small aperture was your 200yd setting. For under 200, and in low light, you use the large aperture. I assume that the army uses 8/3 as their base and use the large aperture for under 300 |
I'm trying to decide what I want to go with, RIBZ or the 8/3-2 at 25 yd zero like we did in the Marines. I know with the USMC zero, the elevation on the rear drum will be on from 200 on out. It'd be great to be able to use RIBZ with a 100 yd zero and have all the other elevations close vs. holding under at 100 with a 25 yd zero. I don't ask for much...lol. 
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Quoted:
For a 20" A2, I don't see how the RBIZ is any better than how we did things in the Corps. The rear sights were 8/3 -2 (3 down bottomed out). Initial zero was shot at 25yds for group, rear sight set at 8/3, and then verified at the 300yd line. Then 8/3-2 with the small aperture was your 200yd setting. For under 200, and in low light, you use the large aperture. I assume that the army uses 8/3 as their base and use the large aperture for under 300 Old Marine 
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Quoted:
Actually BZO for the Corps was with the M855 trajectory, it was shot at 36 yards representing 300 yards. The rear sight should be at 8/3 with small aperture and all elevation adjustments made with the front sight. When you fine tune your zero it should be on at 200 with 8/3-2 and about 1.5" high with 8/3-2 at 100 yds all using the small aperture. Old Marine So many different sighting schemes and variations makes it hard to decide, but I'm leaning towards the 36 yard zero, I can live a 1-1/2" high at 100yds, plus I want my elevation to be on with the rear drum at farther ranges. |
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