M-4 failure
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Old 06-08-2011, 04:06 PM   #1
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Default M-4 failure

We had an incident a last week with one of our officers and his personal M-4. It is believed that a round “telescoped” into the casing and caused such an increase in preassure that it resulted in the following catastrophic failure. Officer was not hurt but weapon is a total loss.

Scubie

m4-failure0001.jpg   m4-failure0002.jpg   m4-failure0003.jpg   m4-failure0004.jpg  
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Old 06-08-2011, 04:08 PM   #2
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Next set of photos....

m4-failure0005.jpg   m4-failure0006.jpg   m4-failure0007.jpg   m4-failure0008.jpg  
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Old 06-08-2011, 04:09 PM   #3
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last set.........

m4-failure0009.jpg  
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Old 06-08-2011, 04:11 PM   #4
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I'm trying to wrap my head around how this happened, But I don't understand the term "telescoping"
CRAZY none the less

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Old 06-08-2011, 04:55 PM   #5
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Wow, that's amazing! Glad he wasn't hurt, but I don't get "telescoping" either. Enlighten us.

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Old 06-08-2011, 05:04 PM   #6
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Sorry guys sometimes I think everyone knows what I’m thinking when I’m thinking it.

Telescoping is when the round (bullet) is forced down into the neck of the cartridge (brass case) kind of like a old time telescope or a collapsible baton. This causes an increase in pressure when fired. If the bullet is not aligned with the neck opening or completely out of the neck and in the casing then you have a catastrophic failure as the round has no where to go.

I’ve heard of these but never witnessed one myself.


Scubie

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Old 07-07-2011, 04:17 PM   #7
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Great post, scubie!!!

After looking at the pictures, I was wondering if the lower was also damaged?

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Last edited by hydrashok; 07-07-2011 at 04:20 PM. Reason: Brain fart: the feed ramp is part of the bbl on an M4
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Old 07-07-2011, 04:23 PM   #8
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Wow, that's nasty. I'm glad the officer is alright.

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Old 07-07-2011, 04:31 PM   #9
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Saw a kaboom on another forum recently that caused similar damage.
It was caused by an apparent squib round lodging in the barrel just in front of the chamber. Shooter didn't hear the squib and treated the stoppage like a fail to fire.
Tap-Rack-BOOM. Actually blew the flat top rail and optic off the rifle.
Shooter was also unhurt

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Old 07-07-2011, 04:42 PM   #10
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Just a cupla questions what amo was he using or was he rolling his own?
Thanks F.K.

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