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AR-15 Accuracy Help

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  #1  
Unread 03-28-2009, 11:36 PM
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Join Date: Dec 2008
Location: SW Idaho
Posts: 193
AR-15 Accuracy Help

Started with a standard Bushmaster A2 Carbine (16" heavy barrel) that I bought 10 years ago...but hardly shot.

I wanted to turn it into a varmint rifle and start shooting it more so I put on a flat top receiver, free floating tube, Vortex scope, and adjustable gas block - all else is stock.

I was very disappointed today when I turned in 2" - 3" groups at 100 yds. I was shooting PMC factory ammo - 55gr. FMJ BT.

I was hoping that this rifle would shoot something close to moa (understanding that I might not quite get there with non-match ammo and a standard chrome-lined barrel). Maybe that was too much to hope for, but 2-3 moa...really?

What advice can you give to get me down into the moa region?
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  •   #2  
    Unread 03-29-2009, 06:52 AM
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    Join Date: May 2004
    Location: southeast michigan
    Posts: 495
    Re: AR-15 Accuracy Help

    what barrel twist?

    maybe try a heavier bullet?
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      #3  
    Unread 03-29-2009, 07:20 AM
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    Join Date: Mar 2008
    Location: Helena, AR
    Posts: 300
    Re: AR-15 Accuracy Help

    I would look at the twist rate and try to match bullet weight with twist. Also if you can find some different factory ammo, try several different brands.
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      #4  
    Unread 03-29-2009, 08:19 AM
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    Join Date: Jan 2008
    Location: SOCIALIST CONTROLLED TERRITORY OF NEW YORK
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    Re: AR-15 Accuracy Help

    I own 4 ARs and every one of them is more than capable of MOA. Get Black Hills ammo blue box is fine. Chances are your twist rate is 1-9 and the 55g bullets will work fine.

    ARs are silly a lot of things will affect the accury.
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      #5  
    Unread 03-29-2009, 08:26 AM
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    Join Date: May 2004
    Location: southeast michigan
    Posts: 495
    Re: AR-15 Accuracy Help

    Get a "Rock River"... just joking... I love'em all!

    Seriously, after testing different ammo, would look at a different barrel
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      #6  
    Unread 03-29-2009, 10:31 AM
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    Join Date: Dec 2008
    Location: SW Idaho
    Posts: 193
    Re: AR-15 Accuracy Help

    Thanks for all the replies. The barrel is 1:9, so in theory the 55gr should be ok. I guess I'll try some better ammo and see what happens.

    On the "new barrel" suggestions, I'll need a new hand guard and gas tube as well as getting the bolt head-spaced...anything ellse? Would you just get a whole new upper?

    I was going to attach some images, but I guess I don't know how...I'll figure that out and come back later with pics.
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      #7  
    Unread 03-29-2009, 10:39 AM
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    Location: SOCIALIST CONTROLLED TERRITORY OF NEW YORK
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    Re: AR-15 Accuracy Help

    I have never seen an AR that would not shoot with the right ammo shooter combination.

    Have you had some one else shoot it?

    ARs are finicky I would have a AR specific gunsmith look it over before I scraped it.

    Will you post some pics of the bolt and bolt carrier with close ups of the gas key? Have there been any feeding issues?

    I will post your pics or teach you how to if you like just pm me
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