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WTF
Discussions related to Guns and Firearms

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Vince
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Joined: May 25, 2005
Posts: 15113
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PostPosted: Sat Jan 23, 2021 4:25 am    Post subject: WTF Reply with quote

I have no information on this other than what you see in the pics. I’m thinking a possible overload is to blame.



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pete4d
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Joined: Nov 27, 2011
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PostPosted: Sat Jan 23, 2021 5:16 am    Post subject: Re: WTF Reply with quote

Scratch Possible over load or maybe a bullet stuck in barrel ,wrong powder ?

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Elvis
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Joined: Jul 27, 2008
Posts: 8726
Location: south island New Zealand

PostPosted: Sat Jan 23, 2021 9:16 pm    Post subject: Re: WTF Reply with quote

well my guess is the think is poked...plain n simply poked.....time to buy a new one....

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dhc4ever
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Joined: May 26, 2011
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Location: Ipswich, Queensland Australia

PostPosted: Sun Jan 24, 2021 2:04 pm    Post subject: Re: WTF Reply with quote

Now THAT takes talent.
Special school type talent, but talent never the less.
Seriously I can think of at least 3 things that might contribute to this, 4 if the owner is a moron.

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Dont do anything you wont like explaining to the paramedics..............
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English Mike
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Joined: Jan 08, 2007
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Location: Whitehaven, Cumbria, UK

PostPosted: Sun Jan 24, 2021 4:29 pm    Post subject: Re: WTF Reply with quote

Bolt lugs look OK as does the barrel, so I can't see it being overpressure.
Possibly the bolt not quite fully rotated into battery.
Trodden on when propped up, fallen with or run over would be my guess.
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DallanC
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Joined: Jan 18, 2005
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Location: Utah

PostPosted: Sun Jan 24, 2021 6:44 pm    Post subject: Re: WTF Reply with quote

English Mike wrote:
Bolt lugs look OK as does the barrel, so I can't see it being overpressure.
Possibly the bolt not quite fully rotated into battery.
Trodden on when propped up, fallen with or run over would be my guess.

Either way, it was DEFINITELY cracked around that area before it was fired.

-DallanC
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slimjim
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Joined: May 16, 2009
Posts: 8195
Location: Fort Worth TX

PostPosted: Sun Jan 24, 2021 8:23 pm    Post subject: Re: WTF Reply with quote

The upper is well used, abused, and worn out. I'm with Elvis, this was "poked" to many time with the gas piston. Should have stayed with direct impingement as the rifle was originally designed to operate.

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dhc4ever
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PostPosted: Mon Jan 25, 2021 2:37 pm    Post subject: Re: WTF Reply with quote

So out of the MILLIONS of AR 15 platforms in use, how many have failed like this?

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Dont do anything you wont like explaining to the paramedics..............
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slimjim
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PostPosted: Mon Jan 25, 2021 3:26 pm    Post subject: Re: WTF Reply with quote

first I have seen, but notice that it is not a mil-spec upper receiver.

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PaulS
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Joined: Feb 18, 2006
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PostPosted: Mon Jan 25, 2021 9:15 pm    Post subject: Re: WTF Reply with quote

No, but it separated at the threads on the upper receiver. I don't see a radius cut at the end of the threads. If you were going to see a fracture that is the exact place.
Also, bear in mind that aluminum has a limited number of cycles before fatigue failures happen. There is no aluminum alloy that can get past that weakness in aluminum.

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Paul
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Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
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Last edited by PaulS on Wed Jan 27, 2021 8:26 pm; edited 1 time in total
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inthedark
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Joined: Jan 31, 2011
Posts: 901
Location: Ontario

PostPosted: Tue Jan 26, 2021 10:19 am    Post subject: Re: WTF Reply with quote

I would have to concur with the upper failing from metal fatigue and there almost appears to me to be a question on the timing of this rifle as there is a consistent amount of burnt powder on the chamber end and the push rod which would lead me to believe that there is a greater amount gas blow by on the push rod. I base this on having a good deal of experience with the FN LAR//Cdn FN C1A1 which has a push rod and a gas adjustment also 1-9 setting and reverse for grenade launching. I would be interested in seeing the gas block and ammunition fired /loaded for this HK.

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Bushmaster
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Joined: Jun 12, 2005
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Location: Ava, Missouri

PostPosted: Tue Jan 26, 2021 10:22 am    Post subject: Re: WTF Reply with quote

Paul...You want to edit that? Just askin'...

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PaulS
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PostPosted: Wed Jan 27, 2021 8:28 pm    Post subject: Re: WTF Reply with quote

Thanks Bushy, I'll leave it like it is for now. (allow alloy nearly the same thing) Smile

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Paul
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Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads
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northdude
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Joined: Oct 10, 2021
Posts: 78
Location: New Zealand

PostPosted: Wed Oct 13, 2021 1:37 am    Post subject: Re: WTF Reply with quote

I hear jb weld is pretty good stuff
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