- Location
- Lethbridge
OK, sue me, one is a .22 wanna be. But the other two are all business.
The Battle Rifle Pictures Thread
- Thread starter Fenix.NZ
- Start date
OK, sue me, one is a .22 wanna be. But the other two are all business.
Dude...go !@#$ yourself
God, I would love a SVD. Are you going to show off totally legal silencers?
like this? .... no
... seriously though not on my battle rifles.. 
- Location
- Kitchener,Ontario
I like my Norinco,it has served me well
boss351cleveland
CGN frequent flyer
- Location
- Down by the river
norinco shorty i bought november 2011, made one range trip.... I got a new one coming soon
It seems like there is a pattern of this happening to the recent imports of shorties ?? Never seen any reports of this happening with full size models?? I hope you get a refund from the importer of that POS.
Ardent
CGN Ultra frequent flyer
I'd be asking for a refund not a new rifle myself too, if ever there was a case of "Not doing that again" this would be it for me. A barrel failure is one small step away from dead / blind shooter, and if there is a pattern in this developing I can't believe any retailer would be willing to take the legal liability to sell them.
Yes that was a year and a half ago. I was superbly treated by can am! I am very happy with them.
What happend is over indexing bof the barrel, if its going to go it will be in the first 5 rounds can am now check them befor they go out the door.
Ardent
CGN Ultra frequent flyer
Perhaps I'm not understanding how "over indexing" could cause this and there's a good reason, so please educate me. To cause the barrel to shear at the threads you would have to wind the barrel into the receiver farther and harder than is likely possible, just look at a bolt made of steel similar to barrel steel, it can support up to tens of thousands of pounds before failing in the axis the barrel would be stressed by "over indexing". If the threads simply stripped away, pulling a number out of the air going by bolts of similar sizes and chooosing the lowest quality stuff those too should be capable of more than 10,000lbs tensile. You would probably have to wind the barrel in on the order of a half a dozen turns too many once it had already stopped to come close to this stuff, that's beyond over indexing! I go into this because smiths have intentionally installed Mauser barrels at 1,000 ft-lbs of torque and for all intents and purposes shank lengths and diameters are reasonably similar to an M14. If anything would be "over indexing", 1,000 ft-lbs would be.
Were you given an explanation how that could cause barrel shearing? This looks like a materials problem to me, and I cannot understand how the barrel being tighter, to simplify the term over-indexing, could cause it. It wouldn't be due to torque from the op rod forcing the barrel to the side if it wasn't indexed properly, as the roll pin in the op rod guide would shear a million times before a barrel would snap off. The forces indicated in your kaboom there are astronomical. If I was you, I'd consider myself lucky, and walk away.
Why is this being hashed out again? I thought it was done with...isn't the thread supposed to be showing off stuff? My semi-battle rifle (two have the sporterized stocks, but are great shooters) collection
Old Eddystone Action - really good - ignore the sporterization.
'54 No.4 Mk2
Sportered stock - K98 - all markings and waffens intact.
Old Eddystone Action - really good - ignore the sporterization.
'54 No.4 Mk2
Sportered stock - K98 - all markings and waffens intact.
Ardent
CGN Ultra frequent flyer
I'm going to make a wild guess you own a Norinco. This is the first I've seen this, and it is shocking, and I would like to know more.
- Location
- Vancouver BC
Over tightening puts a huge preload on the material. Add in the torque applied in bending (from op rod and such) and this can lead to a very short fatigue life ending in rapid and catastrophic failure.
It's just solid mechanics, fatigue and fracture mechanics. Crack some books.
The loading on the m14 is totally different than on the Mauser.
It's just solid mechanics, fatigue and fracture mechanics. Crack some books.
The loading on the m14 is totally different than on the Mauser.
You hate Norinco. We get it. This is the same single failure that happened over a year ago not a new one. If you want to know more, find the original thread. Then Google "Springfield Armory M1A explosion" before you go on about how Chinese rifles are inferior. Anyone can make a dud.
Now please stop derailing, some people are trying to get the battle rifle picture thread restarted.
Ardent
CGN Ultra frequent flyer
Cracked plenty thanks for the suggestion, and that's why this doesn't make sense. "Fatigue life" under no circumstances lasts within the first five rounds as indicated by the owner, that is failure, not fatigue, and I'm curious what books you've cracked to bring you to your informed opinion. In addition, the op rod cannot put any meaningful amount of bending force on the barrel, as it is held from spinning only by a tiny roll pin (barely as much metal there as a bobby pin). It wasn't fatigue as you insinuate, given this was the rifle's first range trip and it occurred within 5 rounds, no matter how many extra times the barrel was screwed into the receiver. It was almost certainly, and this is by "cracking books" I appreciate the suggestion, a materials issue.
I have to ask, wouldn't we have seen this issue in USGI M14s a thousand times over if they really failed like this from the barrel being an 1/8" too tight, what with all the 19 year old armourers working in tents in Vietnam and elsewhere? If the tolerance was that fine in a good M14, where a barrel a tiny bit of a turn too far (so little too far that function of the firearm isn't even effected, and it feeds, fires, and ejects) causes the barrel to shear and launch from the firearm towards the target, you don't think this would be a known failure? Or something folks screwing barrels onto M14's would be extremely worried about? I've installed M14 barrels myself (USGI to Norc receiver when I still shot them) and the amount further you can go without binding the op rod would be so minimal you're not about to induce failures in my opinion. Gas system flexing is the only possible source of a shear failure from my eyes and it's neither strong enough nor is it about to do it within 5 rounds in my opinion.
What books might I ask that I'm missing?
Tim, you're right, I'm no fan. I've googled and read about the catastrophic M1A failure, which is a USGI failure unless I'm to be corrected, as the barrel blew first and I do believe that was a USGI part was it not? It was also an ammo related failure too if memory serves, was it not?
In respect to the thread, here's my not yet complete all TRW M1A, "Big Green"
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- Location
- Vancouver BC
Fatigue can be fast, and I'm not arguing that the steel is cheaper or not.
The bending is added on top of a potentially high pre-load, and the removed. Cyclic loading leading to fracture is fatigue. Either way there was a failure of the rifle.
Can't cite any books of the top of my head, just remembering my fracture an fatigue courses I took during engineering school.
All I was saying is that failure as described and the theorized cause is plausible from the number of bolts I have seen snapped in half (perfect circular cross section) by pre-load and vibration.
The bending is added on top of a potentially high pre-load, and the removed. Cyclic loading leading to fracture is fatigue. Either way there was a failure of the rifle.
Can't cite any books of the top of my head, just remembering my fracture an fatigue courses I took during engineering school.
All I was saying is that failure as described and the theorized cause is plausible from the number of bolts I have seen snapped in half (perfect circular cross section) by pre-load and vibration.
Ardent
CGN Ultra frequent flyer
Fair enough, I've seen the same with large bolts in my job, just never immediately (less than 5 load cycles). Myself I'm just a pilot not an engineer but we take metal fatigue, load cycles, and so forth fairly seriously. I've just never seen a bolt of any comparable strength to an M14 barrel shear off in less than five load cycles, at what is actually quite a low torque value when they're installed for the size of the threads / barrel shank. The miniscule amount further you can go without destroying function just doesn't jive with me for being enough to shear a chrome moly barrel in half with near zero cycles.
Back to the scheduled programming of good photos.
Ardent
CGN Ultra frequent flyer
What mount is that Tim? Looks like a side mount only as per Bassett style, holds zero AOK? I'm interested in trying a Bassett as it would let me put optics on and off rapidly while maintaining zero (or very near) without leaving the mount on all the time, as I generally prefer irons but here and there a scope is fun.
- Location
- Vancouver BC
One last thing, is that because it is hollow, the load distribution would get pretty funky.
Internet points if someone can post a load distribution simulation, which would be somewhat on topic.
