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Thread: Sight Radius Question

  1. #21
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    Quote Originally Posted by MistWolf View Post
    A longer sight radius gives a smaller angle and gives finer sighting. The tradeoff is that it's slower. A shorter sight radius is faster to align, but the trade off is the angle is wider and sighting is coarse. The finer the sighting angle, the more consistent the accuracy of the shooter.
    Im not saying you're wrong, but im curious how the longer sight radius is slower than a shorter one? I understand the difference in the angle, but as far as aligning the sights, both will require the same amount of shooter input to align if youre gripping the handguard in the same place. To be fair, the sight picture of the longer radius does not need to be aligned as perfectly as the shorter radius to achieve the same level of accuracy...

  2. #22
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    Quote Originally Posted by the 556 guy View Post
    I changed my FSB to a low-profile block, and added the longest Troy Alpha to my 16" barrel on my 6920. All this for the purpose of putting a flip up sight out near the A2 birdcage compensator.
    Quote Originally Posted by the 556 guy View Post
    I have no optic, so that's one troubleshooting tool out, but I understand why: it would be affixed to the upper's rail, hence the sling, tube, and FSP become nullities in the equation.

    Back to the range

    I'm afraid to ask, but did you really do all of this thinking you would improve accuracy with a longer sight radius, and NOT so that you could mount an optic?!

    Somebody here will correct me if I'm wrong, but AFAIK by far the best front iron sight for the AR is a USGI FSB, pinned to the barrel.

    If you're going to use iron sights, and you want a longer sight radius, then you should go to a dissipator set-up and pin a FSB further out on the barrel.

  3. #23
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    Quote Originally Posted by Bimmer View Post
    I'm afraid to ask, but did you really do all of this thinking you would improve accuracy with a longer sight radius, and NOT so that you could mount an optic?!

    Somebody here will correct me if I'm wrong, but AFAIK by far the best front iron sight for the AR is a USGI FSB, pinned to the barrel.

    If you're going to use iron sights, and you want a longer sight radius, then you should go to a dissipator set-up and pin a FSB further out on the barrel.
    no no, the plan is for an optic. probably within the next month or so - already have the T-1 or H-1 in my sights.

    And, I considered pinning the FSB further out on the barrel, but liked the idea of folding it down to keep the optic's sight picture clean.

    Why do all this before getting the optic? Following the notion of "training as you would fight," I wanted to be proficient with the sights that I'd have on the rifle. My thoughts were that this couple months of range time with the flip up sights would be great pre-optic.

    This is all sounding way too over-analyzed, its not. Just simple finances combined with training. Even though, right now, I'm missing that USGI FSB (which I still have).

  4. #24
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    Quote Originally Posted by MistWolf View Post
    With the front sight mounted to the free float tube, point of impact will shift as the tube is deflected. The further down the tube the front sight is mounted, the greater the shift in the point of impact
    +1

    If I were going to shoot irons I would look at one of the Noveske type barrels where right behind the muzzle the barrel is the same diameter so a FSB may be attached. If your barrel heats up and walks, you'll have a better POA POI vs fixed to a float tube. Then again this setup may not be practical to all shooters/situations and a float tube mounted front sight may be necessary. Thinking aloud, there's gotta be products on the market to answer this.
    -Thomas

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  5. #25
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    Quote Originally Posted by Badger89 View Post
    Im not saying you're wrong, but im curious how the longer sight radius is slower than a shorter one? I understand the difference in the angle, but as far as aligning the sights, both will require the same amount of shooter input to align if youre gripping the handguard in the same place. To be fair, the sight picture of the longer radius does not need to be aligned as perfectly as the shorter radius to achieve the same level of accuracy...
    Because with a longer sight radius, it's easier for the eye to detect imperfections in the sight alignment. As the imperfections are smaller, the shooter must make smaller, finer corrections which takes more time.

    With a shorter sight radius, the shooter's eye does not detect the smaller imperfections and the sight alignment wavers less. Aligment is coarser and easier to accomplish and the brain sees a good, solid alignment quicker. Because adjustments are coarser, fine accuracy is sacrificed. It's also faster for the eye to pick up and realign short radius sights between shots.

    Another way to think about it is like this- One shooter has sights with 1 MOA adjustments. The other has 1/4 MOA adjustments. The first shooter can make sight adjustments quicker than the second, but the adjustments are not as fine.

    What this means is, for fast shooting at close ranges, the speed of a short sight radius far out-weighs it's coarseness. For deliberate, long range work, the precision of the long sight radius outweighs the extra time taken to align the sights
    Last edited by MistWolf; 06-07-13 at 12:16.
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  6. #26
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    Quote Originally Posted by markm View Post
    Well that troy thing at least has the correct shaped sight ears.
    like this you mean???




    never push a wrench...

  7. #27
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    The problem was how I was using the sling

    Somewhere on M4C, maybe someone's tagline, says, "over 90% of the questions posted on gun related forums could be answered with a trip to the gun range." Well, this problem needed both feedback here and a trip to the range.

    I was using the sling to stabilize the rifle, and learned that it's just not necessary. apparently, with the FSP at the end of a 12" FF tube, the force I was applying to the tube through the sling was enough to make well-aimed shot groups 3.5" at 50 yards.

    Today, I removed the sling and shot 3" groups at 100 yards. Not as good as it should be, but there's still the "loose nut behing the buttstock" factor

    Good technique was important. go figure.
    Last edited by the 556 guy; 06-08-13 at 21:29.

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