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Posted: 3/15/2009 5:31:05 PM EDT
| I have a flattop with integrated rail.My scope was uncomfortably low .An issue Ive read about here in the past.I tried a set of high rings and still had the problem.Bought a tri-mount and put it on the rail.Now Im new at this scope off the barrel set up.Please advise me on the proper way to zero, when my scope is 3 inches above the barrel? My bore-sighter is way low? I dont want to shimm , any help is appreciated guys. Thanks Gary |
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Ideally, you want the scope centerline to be about 1.4-1.5" above the rail (iron sights are 1.4" above the rail). Rings for this height are generally called extra high or ultra high, and there aren't as many available as rings for standard rifles, where you want the scope to be close to the bore.
Your mount looks a little too high, but you can zero it in regardless. The rail is 1.2" above the bore, so if you measure your scope centerline height above the rail and add 1.2" to it, you'll have your centerline height over the bore. If your boresighter is a laser in the bore, then you can get it close like this: - Measure your scope centerline, and use that in place of 3" in the example. If your scope centerline is 3" above the rail, add the 1.2" to that for 4.2" centerline above the bore. - Make two dots or cross-hairs 4.2" apart on a sheet of paper. - Line up the laser dot on the bottom one, and line up the scope on the top one. This will give you a point-blank range zero. This'll get you on the paper at short ranges, and will be low as you go further out, so start at, say, 25 yards, zero, then move out and re-zero at whatever range you need to be zeroed at. With a very high scope height, your trajectory will be different than the standard zero, but you can work around that. For other mounting options, here's the Big List of AR15 one-piece mounts, including sections on rings and extended rails: Big List of AR15 One-Piece Mounts |
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