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Thread: Trouble zeroing with irons only.

  1. #1
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    Trouble zeroing with irons only.

    Hey all, I have a 16 BCM middy with a FSB and a troy Di-Optic FoldingBattlesight. Went to the range today to try an zero. Needless to say I was getting pretty frustrated. Never attempted this before but I couldn't get any of my shots close to each other. I know I am new at shooting AR's but I also knw that I am not that horrible shooter. I started out at around 150ft and none of my bullets went where I was aiming. Some where high and right, and some where high and left. I then made some adjustments and the rounds went pretty much the same. Was using PMC 223 ammo. I was shooting from a bench with a Bipod. Had to quit because I didn't have the right tool to help raise my front site post. Any and I mean any advise would help me out here.
    Peace the old fashion way

  2. #2
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    In my experience, PMC is junk. Maybe try some better ammo.

    ETA: I was thinking of UMC and not PMC. I'm sure PMC is fine ammo.
    Last edited by Packman73; 04-15-12 at 12:35.
    Between two groups of people who want to make inconsistent kinds of worlds, I see no remedy but force. - Oliver Wendell Holmes.

  3. #3
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    Quote Originally Posted by DeviousMind View Post
    Hey all, I have a 16 BCM middy with a FSB and a troy Di-Optic FoldingBattlesight. Went to the range today to try an zero. Needless to say I was getting pretty frustrated. Never attempted this before but I couldn't get any of my shots close to each other. I know I am new at shooting AR's but I also knw that I am not that horrible shooter. I started out at around 150ft and none of my bullets went where I was aiming. Some where high and right, and some where high and left. I then made some adjustments and the rounds went pretty much the same. Was using PMC 223 ammo. I was shooting from a bench with a Bipod. Had to quit because I didn't have the right tool to help raise my front site post. Any and I mean any advise would help me out here.
    You did have a tool that could have raised your front sight post. Any FMJ bullet will work.
    Pat
    Serving as a LEO since 1999.
    USPSA# A56876 A Class
    Firearms Instructor
    Armorer for AR15, 1911, Glocks and Remington 870 shotguns.

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    Quote Originally Posted by Alaskapopo View Post
    You did have a tool that could have raised your front sight post. Any FMJ bullet will work.
    Pat
    Yes, this and I've found that small screwdrivers are perfect as well.

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    You are leaving out important information. How big of a group were you shooting? Pretty tough to help if you can't give us that info.

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    I have a set of front and rear Daniel defense fixed, rail mounted sights that were way off the 1st time out(not even on paper). I removed the upper from the lower, removed the bcg from the upper and steadied the upper best i could on my rest. I looked down the bore, lined it up with the target and adjusted the sights accordingly(this got me on paper) then i walked my groups up and to the left till the rifle was on.
    This may be a primitive approach but really wasn't all that time consuming or wasteful of ammo and was a rather effective method for me.

  7. #7
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    By chance did you check to see if the barrel nut is tight? Bypods if attatched or supported by the barrel can alter impact points if you exert alot of downward pressure. Is your barrel a LW? Savage

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    Quote Originally Posted by AKDoug View Post
    You are leaving out important information. How big of a group were you shooting? Pretty tough to help if you can't give us that info.
    Sorry, meant to put this in. My best group was about 5 inches. Worst group was 8inches.
    Peace the old fashion way

  9. #9
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    Quote Originally Posted by Alaskapopo View Post
    You did have a tool that could have raised your front sight post. Any FMJ bullet will work.
    Pat
    I did try that but couldn't seem to get it to spin and honestly I am not real sure which way I need to spin it. It says UP with a arrow pointing left so I guess that means turn left to raise the post? And by raising the fsp does that bring my shots down?
    Peace the old fashion way

  10. #10
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    I also haven't found PMC to be very accurate, but at 150ft (50 yards) it should at least be on the paper and in fist sized groups.

    Some good reading here:
    https://www.m4carbine.net/showthread.php?t=65679 about the concept of zeroing. Pick a zero (25m, 200m, 300m, etc.) and zero to that.

    L3/EOTech has a decent target for zeroing your irons you can download here:
    http://www.eotech-inc.com/documents/...ire_Target.pdf
    This is for 25m zeroing for a 300m zero.
    Last edited by interfan; 04-25-12 at 01:43.

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