NEW M305 broke the bolt!

Merovingian said:
First thing that stood out when I opened my shipping box, A super Tremclad black looking bolt. At first glance it looked almost plastic.
Perhaps a new blend of metal & polymer the Chinese are trying to bring to the world :p

SjvRDmD.jpg
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I notice from your picture that your extractor seems the same as the rest of the rifle. Mine is similar to the rest of the bolt.

The rest of my rifle is right full of machining marks and seems like proper metal, except the trigger, wich I don't mind if it's sintered.
 
6ohmoney said:
Kinda seems like a bull#### response sfrc. Who cares if the purchase was made 3 months ago. I’ve boughten countless fire arms when the are on sale for example with no intention on using them for months. Mental note for me is to never shop at your store. Thanks for the heads up
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We aren’t the warranty center for Norinco. The customer was directed to the proper warranty center for the product. There are different sized bolts for Norinco M14’s which the warranty center has. It’s the same with pretty much any brand, they have warranty centers which are trained to deal with repairing their products.

Ryan
 
For comparison, here are a couple of photos of a slightly earlier serial number. No pattern of circular (MIM?) marks. No black paint appearance. Tooling marks similar to those on the receiver.

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j2ulYOs.jpg


P1410xx vs P1419xx and P1422xx which had the bolts break.
 
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Good riddance...self important, long winded posts with no valuable info. Barney is the MAN on all thing M14. Never met a more helpful person who CONTRIBUTES to the gun community in all my years.
45ACPKING said:
LOL dude, I'm 48 years old.... pushing 49...... I'm retired and I get to walk my property in the country with my dogs every day. Been married 10 years and happily at that. Got all my toys, a great big heated shop.... a lake full of fish within walking distance and I can hunt right out my back door with a crossbow..... no baggage here..... just quality living , how I want , when I want.

But.... with that said, I'm realizing that coming here and speaking my mind is simply a waste of my time and it gets me cranky seeing the same old drivel and threads on fuggered up rifles. The community stopped moving forward some time ago and it just in rinse repeat mode. To be truthful, some of the worst people in life , those two faced mutherfuggers we all come across from time to time , I've met more of them here in this community than I care to admit. So , it's time to part ways.

I'll spare all you "sensative alpha males" from my attitude and long winded posts haha , I'm out. My contributions to the m14 community end here
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Well if anybody has one of these new MIM bolt M14 pieces of #### they should be contacting the place they bought it from and North Sylva and demand a replacement.
Someone is going to get hurt shooting these things.
 
Hitzy said:
Well if anybody has one of these new MIM bolt M14 pieces of #### they should be contacting the place they bought it from and North Sylva and demand a replacement.
Someone is going to get hurt shooting these things.
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Would the area of where the bolt sheared look any different on a MIM vs a forged bolt?
I still cant a believe a critical part like the bolt would be subsidized with something as inferior and unsafe as MIM. I'm not entirely convinced this is the case, however bolts sheering like this is not the norm from what i've been reading, even for the Norcs
 
Andy011 said:
For comparison, here are a couple of photos of a slightly earlier serial number. No pattern of circular (MIM?) marks. No black paint appearance. Tooling marks similar to those on the receiver.

qUctrMw.jpg


j2ulYOs.jpg


P1410xx vs P1419xx and P1422xx which had the bolts break.
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Well... looks to me they stopped selling those real steel bolts and thought it was a good cost saving measure to make sintered bolts. How can we confirm the material of the bolt?
 
Apple tree said:
Well... looks to me they stopped selling those real steel bolts and thought it was a good cost saving measure to make sintered bolts. How can we confirm the material of the bolt?
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With sintered metallurgy, one can make as good a part not only for less cost, but with less waste. Like any other process, it must be done correctly with the correct materials. Many high stress, high tensile auto parts are made using this process such as engine connecting rods, valve rockers, transmission gears, differential gears etc.

The issue here is not the process, but the method and/or material that is being utilized in that process. I know this does not help with the problem, but chances are that if they committed to this process, they will be sticking with it. We can only hope that they can refine it, adopt better QA practices in the future.
 
Apple tree said:
https://imgur.com/a/NBKK0
NBKK0


I think you nailed it man, there are NO tooling marks on that bolt, except behind both locking lugs where there might have been fitting adjustments made. Hopefully you guys can now see the image attached to this post. See the dots under the bolt? They look an awful lot like mold markings.

This bolt is made of SINTERED METAL, and that's #### for high impact application.
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That is 100% for certain not a forged and machined bolt.

In my opinion, that has been made by MIM with a high temperature partial melt sintering stage.

I would not have chosen this for a high speed, high impact bolt if I were the designer. It might be ok for a static application like a bolt action, but in a semi it is fatigue cracking prone.

I would avoid those bolts fellas.
 
Meroh said:
With sintered metallurgy, one can make as good a part not only for less cost, but with less waste. Like any other process, it must be done correctly with the correct materials. Many high stress, high tensile auto parts are made using this process such as engine connecting rods, valve rockers, transmission gears, differential gears etc.

The issue here is not the process, but the method and/or material that is being utilized in that process. I know this does not help with the problem, but chances are that if they committed to this process, they will be sticking with it. We can only hope that they can refine it, adopt better QA practices in the future.
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MIM is not appropriate for all applications. It's a great technology with its place, but it is not the equal of forged and surface hardened parts for high pressure, high cyclic.
 
Merovingian said:
Would the area of where the bolt sheared look any different on a MIM vs a forged bolt?
I still cant a believe a critical part like the bolt would be subsidized with something as inferior and unsafe as MIM. I'm not entirely convinced this is the case, however bolts sheering like this is not the norm from what i've been reading, even for the Norcs
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Yes. MIM bolts will look like fine grit sandpaper at the fracture point and demonstrate few, if any beach marks radially from the point of crack propagation. This is because they have different grain structure from a forged bolt that was mechanically formed by heat and pressure blows.
 
Meroh said:
With sintered metallurgy, one can make as good a part not only for less cost, but with less waste. Like any other process, it must be done correctly with the correct materials. Many high stress, high tensile auto parts are made using this process such as engine connecting rods, valve rockers, transmission gears, differential gears etc.

The issue here is not the process, but the method and/or material that is being utilized in that process. I know this does not help with the problem, but chances are that if they committed to this process, they will be sticking with it. We can only hope that they can refine it, adopt better QA practices in the future.
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I am not an engineer, but I don't think powdered metal parts are as good as proper forged and machined parts. As an example a lot of higher end chainsaw brands feature forged crankshafts. The part receiving the force benefits from being a proper forged part. Even though sintered parts can be ''pretty good'' sometimes that's not enough, and I feel like thats the situation here.

As previously stated here, we are not even talking about replacing a mild steel part. They are replacing a heat treated tool steel part that bangs back and forth in a forged receiver inches from your face. Im a right handed shooter, and I didn't feel in danger. My wife shoots left handed though, and she might have received that right locking lug or that ejector spring right in the face.

Did those geniuses trying to cut cost try abusing these bolts to see if they were equivalent to proper parts or did they just started shipping them here and we are the guinea pigs? Its not like the price of the rifles went down either, they just risked consumer safety for more profit. In my book thats unacceptable and that's recall material.
 
Hitzy said:
Looks like MIM marks to me...maybe cast?
Either way, something I would not trust the Chinese to do properly, only a few companies in North America can pull that off.
If ALL new M14's are like this, they are junk and NS should be doing a recall.
DrjJzZO_d.jpg
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That's not how investment casting sprues look, they are typically proud of the surface. Those indented sprues are classic MIM.
 
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