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Zeroing flip up sights?

Discussion in 'Black Rifle Forum' started by ElectricZombie, Jan 5, 2010.

  1. ElectricZombie

    ElectricZombie

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    I recently set up one of my AR15s with an EO Tech and a simple backup rear sight. This backup sight is windage adjustable only, so I'll have to adjust the front sight.

    What distance do most people sight their backup sights in for?
     
  2. BOSS302

    BOSS302 Pain is tempora

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  3. lawman800

    lawman800 Juris Glocktor

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    It just keeps getting better, don't it?
    100 metres. Same as the EOTech recommendation for their HWS.
     
  4. NeverMore1701

    NeverMore1701 Fear no Evil Platinum Member

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    50m, that way you're back on at 200m, with no more than a couple inches deviation from 0-300m.
     
  5. X-Spec

    X-Spec

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    +1 This will give the flattest trajectory giving least deviation out to 300 meters.
     
  6. Chuck TX

    Chuck TX CLM

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  7. MCKNBRD

    MCKNBRD

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    Oh, and FWIW, pick one rear aperture and stick with it. If you flip the rear aperture (like on standard A2-style sights, anyway) it does affect windage. Not noticeably inside 100yds, but past that you can be 3-4" off per 100yd, IIRC.

    Byrdman
     
  8. KalashniKEV

    KalashniKEV

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    25m... just like the Army.

    A lot of folks don't print tight enough to zero a red dot or irons at 100m... unless they have:

    1) A magnifier or super eyesight
    2) A suuuub MOA shooter
    3) Skillz

    They'll say it's zeroed but it's really "shot cluster adjusted" and that's not the standard.

    [​IMG]

    A 25m zero will put an M4 on at 300m and a M16A2 on shy of 350m using M855 ammunition. Highest trajectory in between is ~5-9"
     
    Last edited: Jan 5, 2010
  9. Norcal911

    Norcal911

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    KalashniKEV, I would like to respectfully disagree with you. For urban combat, 9 inches is plenty off to miss a head shot when needed and the average police sniper engagement is like 60 yards. That's the average for a SWAT sniper, its way lower for a patrol rifleman, I think the 50 yard zero is the way to go. If you zero at 25 then you need to teach your people range estimation and to hold off in relation to where your shot is vs. your 25 yard zero. If zero'd at 50, all I have to do is teach them to make up for sight offset as they become extremely close to the target. They will very likely never take a shot beyond 50. This would likely be different if you were in the sandbox or maybe you were a rural cop. Alaskapopo, I'm assuming you are rural, what zero do you use?-Norcal911
     
  10. KalashniKEV

    KalashniKEV

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    "Know your weapon and it's POA/POI" is a given, but I think you've painted a very specific, niche scenario that supports your assertion.

    I'd also recommend you take a second look at the trajectory chart, which shows that a 25m zero gives you a maximum 2" offset out to 50m (you stated up front that "police snipers" typically make an avg. 60m (or across the street) shots.

    25m zero is definitely the way to go for all around use, and that is the general advice I give. I support that one may see fit to take that in or out to suit specific needs, but the OP didn't state that he would only be shooting in close.
     
  11. luv2brode

    luv2brode

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    i go 25 meter with a gi zero target old habits, if it aint broke dont fix it
     
  12. faawrenchbndr

    faawrenchbndr SAC trained warrior CLM

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    This works for me,........:supergrin:
     
  13. Norcal911

    Norcal911

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    K, point taken. I'll stick to my 50 yard zero just because its less variation and I'm comfortable with it. Obviously the 25 yard zero works, I used it for 7 years in the Army. This is a hotly debated topic and I think we may be splitting hairs. I'm curious if the military has changed from the 25 yard zero as their battlefield has changed from long range to much shorter urban style engagements in the last 10-20 years?-Norcal911
     
  14. KalashniKEV

    KalashniKEV

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    Nope... 25m is still the standard and always will be. I also think the whole "urban combat" trend is overstated in Internet lore. In Afghanistan there are PID'd hostile targets that are so far away they can only be engaged by company mortars. I've been everywhere in Iraq except for out West and even in urban centers there were always longer shots to be had/made in both directions.
     
  15. Flinter

    Flinter Hornady Fan

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    I agree with KalishniKev
     
  16. nipperwolf

    nipperwolf

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    Agree with the 50yd zero. Good to go from 0-200. I prefer a 2-3" variance, instead of 10". It really is that simple.
     
    Last edited: Jan 5, 2010
  17. Paul Gomez

    Paul Gomez Training Bum

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    Neither the Army nor the Marine Corps use a 25M zero.
     
  18. Mnukedude

    Mnukedude Lurking

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    I use a 50 yard zero myself.
     
  19. ottomatic

    ottomatic

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    Another vote for 50 yards. Up to a little over 200 yards, everything will be plus or minus 2.5"
     
  20. Alaskapopo

    Alaskapopo NRA ENDOWMENT

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    50 yards same as you should do any optics without a bullet drop compensator requiring a 100 yard sight in. A 50 yard 0 puts you on at 200 yards and only 2.5 inches high at 100 if you are using 55 grain ammo. A 100 yard 0 puts you low at all ranges except 100 yards.
    [​IMG]

    [​IMG]
    [​IMG]
    Pat