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Posted: 12/1/2011 8:54:01 AM EDT
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I just assembled a CMMG M4 with a Troy DiOptic BUIS rear behind a Meprolight front pin. At some point in the future, I'll have a TA31 up there somewhere, too. Following the instructions, I mounted the site in the rearmost position of the rail (above the charging handle), but my vision isn't what it used to be, and find that the markings on the site are blurry, making them hard to see. When I move the BUIS to the foremost position of the rail (closest to the pin), the markings are sharper and I have an easier time coming on target. Can any of you guys comment on the advantages / disadvantages of mounting a site in the rearmost position of the rail as opposed to in a more forward slot? I would guess that moving the rear site forward would make the tick marks sharper and more visible to my eye, but reduce the sight radius, so it might be more or less a trade-off in terms of accuracy. Interested in hearing comments about standard practice, versus what to do when you're over 45 years of age. |
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Quoted: I just assembled a CMMG M4 with a Troy DiOptic BUIS rear behind a Meprolight front pin. At some point in the future, I'll have a TA31 up there somewhere, too. Following the instructions, I mounted the site in the rearmost position of the rail (above the charging handle), but my vision isn't what it used to be, and find that the markings on the site are blurry, making them hard to see. When I move the BUIS to the foremost position of the rail (closest to the pin), the markings are sharper and I have an easier time coming on target. Can any of you guys comment on the advantages / disadvantages of mounting a site in the rearmost position of the rail as opposed to in a more forward slot? I would guess that moving the rear site forward would make the tick marks sharper and more visible to my eye, but reduce the sight radius, so it might be more or less a trade-off in terms of accuracy. Interested in hearing comments about standard practice, versus what to do when you're over 45 years of age. The best way to figure this out, IMHO, is to shoot the rifle at both close and far distances in both of the configurations you are interested in, and see what works better for you. |
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My personal feeling is that a BUIS is not necessary with an ACOG. The ACOG a very dependable optic, and not likely to fail. Some of the military folks must think so too since I've seen many a picture of operators with M4s with ACOGs and without a BUIS.
That being said, here's something you might want to think about if you get a TA31 and still want to use a BUIS further towards the front of the rail: I have seen pictures of Marine M16A4s with the ACOG mounted at the very rear of the rail and the backup sight located IN FRONT OF THE ACOG. They do this because the fixed stock of the A4 added to the thickness of the body armor makes it difficult to get proper eye relief with the ACOG. It looks funny, and the BUIS is generally turned around, but it is functional (I actually tried this). Yes, the sight radius is shorter, but remember the "B" in BUIS stands for "backup", and the sight is not intended for use as a primary sight. |
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