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Old December 22, 2010, 08:45 PM   #1
James H
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Firing from closed bolt vs. open bolt m16/m4

For some reason I had this question pop into my head in a dream last night (I think about guns a lot). With a fully automatic capable M16/M4, do these rifles fire from the open bolt position when in fully automatic and then switch to closed bolt when in semi or 3-rd burst?

I've never even shot an AR15, so I have zero experience with the platform. Just wondering.

And by the way, I'm not looking for a run down on all the different models that are either 3-rd burst or fully automatic capable. That's easy enough to find on wikipedia. Just wondering about the fully automatic/bolt open question on the models that are full automatic capable.
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Old December 22, 2010, 08:50 PM   #2
roklok
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closed bolt in all modes of operation.
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Old December 22, 2010, 08:52 PM   #3
James H
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Thanks...that would make more mechanical sense.
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Old December 22, 2010, 09:40 PM   #4
B. Lahey
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There was one model that fired from an open bolt, I think it was an experiment looking toward making a squad automatic weapon sort of deal out of the rifle. It never caught on; for what reason I do not know.
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Old December 22, 2010, 10:03 PM   #5
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It was the LWRC M6A4, IAR. IIRC that particular rifle had 4 position selector. Safe, Semi, Safe, Auto.

From what I've heard from testers on site, Colt also had a rifle which would go open bolt after it reached a certain temperature.

Nonetheless, neither were selected and the USMC has selected the HK416, which from what I know, operates on closed bolt.
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Old December 22, 2010, 10:16 PM   #6
gunmoney
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http://www.youtube.com/watch?v=2YzGzeLh3mc
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Old December 22, 2010, 11:05 PM   #7
James H
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Thanks for the video. The engineering must be ingenious. Especially a rifle that goes to open bolt once the barrel reaches a certain temp, like what was mentioned a couple of posts above.
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Old December 22, 2010, 11:11 PM   #8
10mmAuto
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Yeah, with the exception of some specialized LMGish variants that go to open bolt firing in full auto pretty much an AR derived weapon will fire from a closed bolt in all firing modes.
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Old December 23, 2010, 02:14 AM   #9
ethan95
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Quote:
I think about guns a lot
So im not the only one?

any who, closed bolt on all firing modes.
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