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AR-15 Accuracy Help

 
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  #1  
Old 03-28-2009, 11:36 PM
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Join Date: Dec 2008
Location: SW Idaho
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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  
Old 03-29-2009, 06:52 AM
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Join Date: May 2004
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Re: AR-15 Accuracy Help

what barrel twist?

maybe try a heavier bullet?
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  #3  
Old 03-29-2009, 07:20 AM
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Location: Helena, AR
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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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Old 03-29-2009, 08:19 AM
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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  
Old 03-29-2009, 08:26 AM
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Location: southeast michigan
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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  
Old 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  
Old 03-29-2009, 10:39 AM
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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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