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AR 556 problems

This is a discussion on AR 556 problems within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; I own many AR platform rifles and have used a specific few as an operator and in my capacity as an LEO. Ruger is not ...


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Old Today, 08:16 AM   #1
 
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AR 556 problems

I own many AR platform rifles and have used a specific few as an operator and in my capacity as an LEO. Ruger is not one of those. My brother in law wanted an affordable AR platform rifle so I recommended a Ruger AR 556 to match his price point. He bought one on sale for $489. Our first day on the range, the rifle fired and cycles fine for the first 60 rounds or so, then something interesting started happening. The rifle started shooting two shot burst as if it was in select fire auto mode. I thought he was double tapping the trigger but he wa not. I shot the rifle and it was shooting two and three shot bursts. The cause; I discovered one of the trigger group retaining pins had walked out and the trigger mechanism was slightly canted sideways in the lower receiver. Somehow this caused consistent burst fires.

So this particular brand new Ruger 556 rifle standard trigger group has inadequet detents to hold the trigger group retaining pins in place. So now you know how to turn your ruger into a burst fire rifle. Just let the front trigger pin walk out (NOT RECOMMENDED and UNSAFE). So I replaced his standard factory trigger with a CMC drop in self contained single stage 3.5 lb pull trigger.

Anyone else have this problem with a new 556 Ruger?



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Old Today, 03:31 PM   #2
 
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Mine had a loose castle nut. Other than that, it’s been 100% reliable.
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Old Today, 04:18 PM   #3
 
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The AR556 MPR has a different trigger, i.e. two-stage.
Also has different furniture.
Was worth the extra $70.

Last edited by Rocket_Scientist; Today at 04:21 PM.
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