AR double firing

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Stokesey

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Hi - had a couple of instances today whereby my AR doubled fired (not sure of the correct terminology, the trigger was pulled once and 2 shots were fired in quick succession).

Points to consider:

- This has happened once before, maybe 500 rounds ago
- Rifle is manufacturer supplied (not built by me with parts)
- Nothing has been tampered with
- Round count is approx 850
- I've performed a function test (as detailed on AR15.com) and this all appeared fine
- Ammo being used was Federal bulk (available in the ammo can of 1000 rounds)
- LAR mag used

Any thoughts?

Thanks.
 
If your function test is passing the sear test, maybe short stroking on the first round ejection and slam firing the second. That shouldn't happen though as the bolt override should trip the sear.
Something definitely fubar. This may be painfully obvious, but regardless the cause, stop using it until you have corrected this unsafe condition.
 
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Check your disconnecter for a cracked tail, I've seen this cause an intermittent problem where the hammer rides the bcg forward and will on occasion cause a double. I don't know your level of familiarity with AR's is so don't be offended by this, but the disconnecter is the part that sits inside the trigger, and the tail is the lower extension of the part that goes back under the selector. The place I've seen them crack is right at the top rear corner of the spring saddle cut out, so make sure you check from the spring saddle.
 
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Stokesey said:
Hi - had a couple of instances today whereby my AR doubled fired (not sure of the correct terminology, the trigger was pulled once and 2 shots were fired in quick succession).

Points to consider:

- This has happened once before, maybe 500 rounds ago
Click to expand...

Could be a hammer problem (chipped or worn), same with the sear, or a spring or...Since this has happened twice, it might be time to visit a good smith. If the wrong person hears it go "auto"...
 
zxcvbn said:
Could be a hammer problem (chipped or worn), same with the sear, or a spring or...Since this has happened twice, it might be time to visit a good smith. If the wrong person hears it go "auto"...
Click to expand...

I think it's less about someone hearing his rifle malfunctioning and more about the possibility of an out of battery ignition.
Although I do agree he should probably get in touch with the manufacturer. Unless there is a competent gunsmith who is very familiar with ar15's near where he is.
 
was it cold out? is there too much lube ?



I have seen this happen on real dirty over lubed guns oil or grease will get in around the firing pin then freeze or get stiff
 
Did it fire 2 rounds during the trigger squeeze or while the trigger was being released? I had a rifle team C7 with polished trigger and hammer engagement surfaces that would fire a 2-3 round burst while the trigger was being released slowly. Pretty surprising in a deliberate match! A new hammer fixed the problem.
 
Thanks for the advice guys, I'll answer a few of the questions:

- Yes it is an NEA.
- it was purchased around July last year so not an early model.
- I'm not particularly familiar with AR's (this is my first).
- Not sure if it was on squeeze or release as a friend was shooting it at the time.
- There were no weather implications as I was inside.
- The gun has been cleaned about 100 rounds ago.
- There is a gunsmith at the shooting edge in Calgary, I'm guessing he's pretty competent on the AR platform.

I'll take a look at it again this morning and see if there's anything obvious, failing that i'll get in touch with NEA.

Thanks again.
 
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Where was the safety selector at? Some NEA used full auto safety levers and if you have it on the (what would be) Auto position, it could double fire, since the disconnector is disengaged by that safety position. The hammer would ride the pin back after the first shot.

In truth all of the fire control parts on some NEA Ar15's were full auto parts. Trigger, disconnector and safety. It was only missing the full auto hammer and auto sear. The sear delays the falling of the hammer on the firing pin. That timing gives the hammer enough force to fire the round.
 
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Give NEA a call or file out a trouble ticket online. They will help you out with the issue. There were some guns put out last summer that developed this issue so it may be one of them.

Ryan
 
Hilo71 said:
Where was the safety selector at? Some NEA used full auto safety levers and if you have it on the (what would be) Auto position, it could double fire, since the disconnector is disengaged by that safety position. The hammer would ride the pin back after the first shot.

In truth all of the fire control parts on some NEA Ar15's were full auto parts. Trigger, disconnector and safety. It was only missing the full auto hammer and auto sear. The sear delays the falling of the hammer on the firing pin. That timing gives the hammer enough force to fire the round.
Click to expand...

Not, actually.
 
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