Sight Problems
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  1. #1
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    Sight Problems

    I don't know if this is the right place for this or not so moderators: feel free to move it if you wish (as if you wouldn't anyway lol).

    My son has a Bushmaster AR10 in .308. I'm not sure which model. He usually runs an Eotech on it and it shoots mighty fine.

    Today we were at the range and he decided to sight in the irons. We had to adjust the rear sight all the way to the right to zero it. And I do mean ALL the way to the right - as in absolutely no more travel. A local gun shop mounted the front iron sight but it and post looks fine. It doesn't seem to be canted in any way. The rear sight also looks fine except for being all the way to the right. The rail the rear sight mounts to is also the rail the Eotech mounts to and that dials in great.

    Any ideas what might cause this??? I don't know much about ARs but I'm clueless about this.
    777Driver likes this.
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  2. #2
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    Is the Eotech also dialed far right?
    olfarhors likes this.

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  3. #3
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    No. The EoTech dials in fine.
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    I'd say you might want to loosen the barrel nut and see if you can twist the barrel a bit in the receiver. There's usually a little play between the pin and the notch that indexes it.
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    Crappy iron sights?
    If you're blue and you don't know where to go to, why don't you go where fashion sits......PUTIN ON A RITZ!!!

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    I have a little more info if it makes any difference.

    I thought the front sight was a standard A2 type. It is not. It is an A.R.M.S. #41™-B-L Silhouette™ Front Folding Sight. The rear sight is an A.R.M.S. #40™ Stand Alone Flip-Up Sight.

    I don't know what he actually paid for them but by the looks of their web site it was way too much. lol I don't know if this helps anyone or not.

    He has a standard carry handle style rear sight off of a Colt HBar. I think we're going to try that Sunday and see if we can get it dialed in any better.

    If that doesn't work he's going to take it back to the 'smith and have him check it out.
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    Quote Originally Posted by paulky_2000 View Post
    Crappy iron sights?
    I hope not for what he paid for his sights.
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    Quote Originally Posted by MisterNoisy View Post
    I'd say you might want to loosen the barrel nut and see if you can twist the barrel a bit in the receiver. There's usually a little play between the pin and the notch that indexes it.
    I suggested this to him. He's a little leery because neither of us has ever done anything when it comes to building uppers.
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    Do what I did on all my AR platforms:

    Take off the standard sights and throw them in a drawer......


    .....problem solved......and they're not crowding up the upper rail.
    Last edited by paulky_2000; 04-02-2020 at 07:10 PM.
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  11. #10
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    I am guessing the problem lies in the front sight and how /where it was mounted.
    NOW I am NOT a Black Rifle guy really but have mounted hundreds of optics on other rifles (I use to work in the gun shop business)
    I have an AR that also has the carry handle and I have a red dot that mounts on the top of the handle.
    I have the iron sights battlefield adjusted (in other words) you likely don't want me shooting at you out to several hundred yards, and the red dot is also dead on, the rear sight is centered.
    now due to the red dot being so high above the bore vs the iron sights there is a bit of difference in POI at different ranges but thats to be expected.
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