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Thread: Sight Radius Question

  1. #11
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    Re: Sight Radius Question

    Lot of overthought on this topic......could lead to paralysis by analysis.

  2. #12
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    Quote Originally Posted by the 556 guy View Post
    True. what's a good flip up that's more comparable to the stock FSB?
    Well that troy thing at least has the correct shaped sight ears.
    "You people have too much time on your hands." - scottryan

  3. #13
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    Quote Originally Posted by the 556 guy View Post
    True. what's a good flip up that's more comparable to the stock FSB?
    If you're running an X300 at 12:00, I recommend a Daniel Defense fixed front.

    It fits perfect behind the light and is always there.

    IME, more sight radius does not equal better accuracy or speed.

    I used to run an X300 @ 12:00 with a DD fixed front behind it, the front of the light was flush with the front of the rail so my sight radius was about 1 1/2" shorter than a carbine. No accuracy degradation and very quick.

    I recently got my hands on a 20" A4 upper and shot it with a carry handle rear. Same accuracy as a carbine but much slower.

  4. #14
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    Kyle Defoor posted something about this, hope the link works as I'm on my phone

    http://kyledefoor.tumblr.com/post/42...ons-first-some
    The journey of a thousand miles begins with one step...and a lot of bitching.

  5. #15
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    Quote Originally Posted by kest_01 View Post
    Kyle Defoor posted something about this, hope the link works as I'm on my phone

    http://kyledefoor.tumblr.com/post/42...ons-first-some
    It works. He's talking speed/accuracy combo. His point is valid. But for pure target shooting/long range/shooting groups....

    I've NEVER been able to do as good with a shorter radius than the Rifle.
    "You people have too much time on your hands." - scottryan

  6. #16
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    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.

    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
    Last edited by MistWolf; 06-06-13 at 15:40.
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  7. #17
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    Quote Originally Posted by the 556 guy View Post
    My groups at 50 yards are now larger (4-5 inches) than using the stock FSB and front sight post.
    This is unacceptable... that's 8-10moa.

    I'm guessing here, but I suspect that there's something wrong with your handguard and/or front BUIS. Maybe your front sight is moving relative to the barrel, which is giving you horrible accuracy.

    And are you sure that the problem isn't the loose nut behind the buttstock?

  8. #18
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    Quote Originally Posted by Bimmer View Post
    This is unacceptable... that's 8-10moa.

    I'm guessing here, but I suspect that there's something wrong with your handguard and/or front BUIS. Maybe your front sight is moving relative to the barrel, which is giving you horrible accuracy.

    And are you sure that the problem isn't the loose nut behind the buttstock?
    loose nut behind buttstock - always a possibility. i never rule that out. it was my first thought. but...

    before the troy alpha and MBUS, using an MOE handguard and stock Colt FSB, my three round groups in a modified bench were 1-1.5 inches max. now, not so much.

    if it's not the trigger-puller, then maybe something loose? (comp, handguard, or MBUS?)

  9. #19
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    Quote Originally Posted by the 556 guy View Post
    Before the troy alpha and MBUS, using an MOE handguard and stock Colt FSB, my three round groups in a modified bench were 1-1.5 inches max. now, not so much.

    if it's not the trigger-puller, then maybe something loose? (comp, handguard, or MBUS?)
    Before, using the pinned on FSB, the handguard was irrelevant. Now, I'm guessing there's some wiggle somewhere between the handguard and the upper, or between the front BUIS and the handguard... that's what's changed, so I'd look there.

    Also, are/were you slinging up? Even if there's no tangible play in the handguard, under tension it may be flexing relative to the barrel.

    How does it shoot with an optic? If that sucks, too, then the issue isn't the sights or the handguard...

  10. #20
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    Quote Originally Posted by Bimmer View Post
    Before, using the pinned on FSB, the handguard was irrelevant. Now, I'm guessing there's some wiggle somewhere between the handguard and the upper, or between the front BUIS and the handguard... that's what's changed, so I'd look there.

    Also, are/were you slinging up? Even if there's no tangible play in the handguard, under tension it may be flexing relative to the barrel.

    How does it shoot with an optic? If that sucks, too, then the issue isn't the sights or the handguard...
    Now that you've laid it out, I think I completely understand the mechanics at play.

    Yes to using a sling for stability, and I was tensioning down on it with my reaction arm (forward arm).

    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

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