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Dzscubie 06-08-2011 04:06 PM

M-4 failure
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We had an incident a last week with one of our officers and his personal M-4. It is believed that a round ďtelescopedĒ 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.


Dzscubie 06-08-2011 04:08 PM

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Next set of photos....

Dzscubie 06-08-2011 04:09 PM

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last set.........

VitSports6 06-08-2011 04:11 PM

I'm trying to wrap my head around how this happened, But I don't understand the term "telescoping"
CRAZY none the less :eek:

diggsbakes 06-08-2011 04:55 PM

Wow, that's amazing! Glad he wasn't hurt, but I don't get "telescoping" either. Enlighten us.

Dzscubie 06-08-2011 05:04 PM

Sorry guys sometimes I think everyone knows what Iím thinking when Iím 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.

Iíve heard of these but never witnessed one myself.


hydrashok 07-07-2011 04:17 PM

Great post, scubie!!!

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

CA357 07-07-2011 04:23 PM

Wow, that's nasty. I'm glad the officer is alright.

Gatekeeper 07-07-2011 04:31 PM

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.:eek:
Shooter was also unhurt

Fisherking 07-07-2011 04:42 PM

Just a cupla questions what amo was he using or was he rolling his own?
Thanks F.K.

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