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SR 556 Problem

This is a discussion on SR 556 Problem within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; Went shooting with my SR-556 / 6.8spc. I loaded a magazine, sent the bolt forward and the round went off. The safety was on and ...


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Old July 25th, 2011, 09:24 PM   #1
 
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SR 556 Problem

Went shooting with my SR-556 / 6.8spc. I loaded a magazine, sent the bolt forward and the round went off. The safety was on and the trigger was not being touched. The impact of the bolt ignited the round. To test it, I cycled 12 rounds through the gun without firing, just chambering and ejecting and all of the rounds showed a dimple from the firing pin on the primers. I contacted Ruger and was told that the free floating pin design will leave a light impression on the primers. The dimples on my rounds were distinct not light. I was surprised that the other rounds didn't go off either. I was shooting a mixed bag of Silver State Armory, Remington, and Hornady rounds and all showed the same dimpled firing pin. Ruger requested that I sent the gun back for them to check. Anyone else had this problem? Anyone ever checked to see if their firing pin was leaving marks?




Last edited by dyogi; July 26th, 2011 at 12:15 AM.
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Old July 25th, 2011, 09:38 PM   #2
 
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Welcome to the Ruger forum dyogi.



That's the first I've heard of this.I'd have that back to Ruger ASAP. That sounds like a accident waiting to happen.
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Old July 26th, 2011, 12:16 AM   #3
 
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It's going back to Ruger first thing tomorrow! If I'm having this problem, I'd bet that someone else must be having it too and may not even realize it. From the looks of the firing pin marks any of the rounds could have gone off but only that one did. As you say, an accident waiting to happen
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Old July 26th, 2011, 01:52 AM   #4
 
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I haven't had it happen, and I haven't checked for the dimple either. Will be sure to check next time I take it out. Thanks, for the heads up.
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Old July 26th, 2011, 02:22 AM   #5
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Dumb question.... Is the firing pin spring in the bolt? Also is the firing pin protruding from the bolt?
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Old July 26th, 2011, 03:20 PM   #6
 
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The bolt/firing pin looks and operates normal as far as I can tell. If Ruger does not find a problem, the only thing that I can think of is that there was debris or something holding the firing pin out. Scary stuff though that it can fire without any manipulation of the trigger!
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Old July 26th, 2011, 04:11 PM   #7
 
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Quote:
Originally Posted by TMD View Post
Dumb question.... Is the firing pin spring in the bolt? Also is the firing pin protruding from the bolt?
I'm assuming it's like any other AR in that there is no firing pin spring. The firing pin should be floating, like Ruger indicated. Primer indentions are normal with these type of firearms, but obviously they should not discharge without a trigger squeeze.

Maybe a primer was not fully seated? Doesn't seem like a floating pin would have enough energy to set it off with out the hammer tho, even on a raised primer.

Like you said maybe something was in your bolt carrier that was keeping the firing pin forward.
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Old July 26th, 2011, 10:50 PM   #8
 
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The primers in all rounds were seated properly. I have photos of 13 rounds chambered and ejected which have a heavy firing pin mark on them. I'm actually surprised that more of them hadn't gone off.
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Old July 27th, 2011, 01:02 PM   #9
 
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I have not had that problem. It sounds like something was binding the firing pin keeping it forward.
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Old July 27th, 2011, 01:29 PM   #10
 
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Curious on where the bolt carrier cotter pin is in relation to the firing pin.
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