Brand new m14....but it's a ticking time bomb waiting to happen (with pics)

Completely, shooting with a rifle dunked on oil is going to increase the risk of a failure. when I was in EMER, oily rounds will cause the pressure to spike to a proof load, so if your shooting a proof load oily.... yikes.
 
When the case expands it grips the wall of the chamber and for a minute moment they are one with each other. Oil in your chamber allows that case to slide backwards against the bolt. If you ever fire a bolt action that has an oily chamber you may have difficulty cycling the bolt. With a Norinco M14 it may explain fractured bolts. You fellas ever heard of running a clean patch through your bore to get that light coat of oil out prior to going to the range? Pretty widely accepted practice.
 
Seafury said:
When the case expands it grips the wall of the chamber and for a minute moment they are one with each other. Oil in your chamber allows that case to slide backwards against the bolt. If you ever fire a bolt action that has an oily chamber you may have difficulty cycling the bolt. With a Norinco M14 it may explain fractured bolts. You fellas ever heard of running a clean patch through your bore to get that light coat of oil out prior to going to the range? Pretty widely accepted practice.
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I don't think this holds true... at leaste the sliding back anyways

oil/water/dirt in the chamber takes up space, that is why it increases presure, less volume for the expanding gas. It doesn't seem like much but it makes a huge differance. just like the fractinal thicker walls of military brass increase the presure enough that it takes about %10 less powder to get the same results. and the extra presure is exserted on the chamber ,rearward into the bolt and the bullet.
The force of the round firing is on the bolt regardless, thats why it locks in the first place.....
 
The point I'm making is it is not a sound practice to fire rifles of which the chambers and barrels are full of oil. Take your bolt gun and fire a few rounds with an oily chamber. I've seen one guy who couldn't open the bolt. I can't imagine a dealer doing it.
 
I think if you look back to when the shorty barrels first started showing problems, Canam stated they would be doing this proof testing. I dunno what it entails, but I don't doubt buddy that said he witnessed it.
 
Agreed, I'm sure it is happening no reason to make that up.

And yes oil in a chamber can drastically increase breech face pressure, not just total pressure. Cases actually do grip the walls of the chamber under peak pressures as a design feature. Oil can allow the case to float and load the breach face, and ultimately bolt lugs, in the extreme with a "slam" from the case moving rewards under extreme pressure. This would be even worse in long headspace chambers like Norcs as the firing pin may drive the cartridge forward, the round would then build pressure and move hard rearwards in the space available moving on the oil. Combine this with a proof load, suspect metallurgy, and you may well have a good theory for metal fatigue in the lugs. Made worse by the sketchy fitting of the bolts, for instance if it was bearing only on the one lug.

All theory, but certainly looks plausible as one of the many possible answers given the proofing oiled guns. How would you like to be the guy firing batches of Chinese M14s, oily, for the first time with proof loads? Makes me appreciate my job. Watermine, the fellow with the failed bolt, is sending his Norinco to me for destructive testing for morrisonarms.com if it survives proof loads, I'll oil the chamber to see if that makes a difference.
 
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So I brought the gun into the store today after work, and once again, hats off to Al Flaherty's for their awesome service. I showed them the crack on the gas cylinder and they said that they will send it back, and for that reason, they just gave me a brand new one. Excellent service!

Now I just gotta clean the damn thing....again....
 
You are a trooper man....I've had less then that sour me on a type of firearm. I would have been putting that $500 back in my pocket and never looking at another one again...:)
 
isebsi said:
So I brought the gun into the store today after work, and once again, hats off to Al Flaherty's for their awesome service. I showed them the crack on the gas cylinder and they said that they will send it back, and for that reason, they just gave me a brand new one. Excellent service!

Now I just gotta clean the damn thing....again....
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Hey, practice makes perfect.....:p
 
isebsi said:
So last night I picked up my m305 shorty, and since this was my second m305 I knew it was going to be a long night removing off all that oil. Them chinese really know how to preserve a rifle...


Anyways, after wiping down all that oil I can no longer be called butter fingers when shouldering the rifle. Quite a beauty she is, I think I much prefer the the 18.5" barrel over the 22", that's just me.


So I wanted to give it a nice cleaning and putting my own liquids on it (oil, grease, whatever.) So I stripped down the rifle and lo and behold....a crack....a pretty serious crack I might add. This crack goes right along the gas cylinder, and it's quite alarming because it's the gas cyclinder. If I were to shoot it, it could potentially blow up in my hand. Thank goodness that I didn't over look it. At the same time I was pretty upset because I just degreased the rifle, and the store I bought it from is an hour away... well here are some pics. Hopefully when I send it in for warranty they just give me a new one.

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DO NOT SHOOT THIS RIFLE ANY MORE!
Source a new gas piston. It may hold up for a couple of rounds but the pressure that area goes threw never mind the beating it takes...
Well lets just say a new gas system is better than figuring out what the damage of this grenade can be.
 
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