My M305 went kaboom

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it's easy to diagnose from the armchair at my computer LOL
from seeing the pics and reading thru the thread, i would be satisfied to never use budget ammo like american eagle in an m14 type rifle again.
I am a brass inspection freak and gather it all at end of range day..... and most often from each rifle during each session between target changes. Always looking for pressure defects, bulging, evidence of chamber scoring, pierced primers or primer flow ect.....
one of my rifles pierces primers but only when using SA surplus.... this rifle has a Nato match chamber of 1.6345 and fires federal and win store bought ammo without a hitch... and the brass looks normal all around. Hirtenberger, being a hot one, also fires without a hitch, though the recoil seems more pronounced... no pierced primers though.

if the neck of a case where to stay in the chamber, and that chamber was fairly generous with some bolt slop even on a chambered round....... i could see that particular rifle being able to close far enough on a fresh round to clear the safety bridge and cause the bolt to appear in the locked position to the ey of the shooter. Squeezing the trigger at this point would guarantee a massive pressure spike in the chamber/throat.

i guess, though the discussion serves as an eye opener, it's pretty much impossible to be a guy on the internet trying to diagnose an issue via the key board and pics on the screen :D
very glad you were not injured that's for sure.
 
I havent read all 9 pages of this thread, and I'm not an m305 expert. However, I have seen several unrelated kabooms resulting from double powder loads in crappy ammo and in each situation the casings looked exactly like the ones in your pictures and in the chamber. I'd suspect your problem is also is related to the ammo and not your gun.
 
Wildcard91 said:
I havent read all 9 pages of this thread, and I'm not an m305 expert. However, I have seen several unrelated kabooms resulting from double powder loads in crappy ammo and in each situation the casings looked exactly like the ones in your pictures and in the chamber. I'd suspect your problem is also is related to the ammo and not your gun.
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Let us know how easy it is to get double the powder charge in a 308 case f:P:
 
Wildcard91 said:
I havent read all 9 pages of this thread, and I'm not an m305 expert. However, I have seen several unrelated kabooms resulting from double powder loads in crappy ammo and in each situation the casings looked exactly like the ones in your pictures and in the chamber. I'd suspect your problem is also is related to the ammo and not your gun.
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Ditto on that one. I know that I use 748 and my charge fills the case to the base of the neck...and it's not even the top load listed. Shoots like a damn though. But even with other powders, there is no way one can "double" a powder charge without severe spillage of powder. Hot loads maybe, but not double.

Unless of course, someone mixed it up with say a pistol powder. If that was the case, then perhaps that person needs to rethink their reloading process and develop some serious QA/QC controls, or better yet, just buy factory.
 
Wildcard91 said:
I havent read all 9 pages of this thread, and I'm not an m305 expert. However, I have seen several unrelated kabooms resulting from double powder loads in crappy ammo and in each situation the casings looked exactly like the ones in your pictures and in the chamber. I'd suspect your problem is also is related to the ammo and not your gun.
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Very first line of the original post, second sentence. "Load was American Eagle (Federal) 150gr FMJBT."

Even if you don't read 9 pages of replies, shouldn't you read the first post?
 
Slam fires are caused by soft or high seated primers. The split casing seems suspect of faulty ammo. The main fault is poor assembly and loose parts. The gas system could get worked off if you had multiple slam fires in a row. The m1a group of firearms have a free floating firing pin that will through it's forward action and enertia strike a primer, as do ARs.
 
jamiejaf said:
Slam fires are caused by soft or high seated primers. The split casing seems suspect of faulty ammo. The main fault is poor assembly and loose parts. The gas system could get worked off if you had multiple slam fires in a row. The m1a group of firearms have a free floating firing pin that will through it's forward action and enertia strike a primer, as do ARs.
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slam fires can be caused by incorectly or insuffuciently seated primers.... true
but they can also be caused by a neck in the chamber ;)
foreign material stuck in firing pin channel ie: chunks of brass from pierced primers... seen it numerous times at clinics.
slam fires with primer causes are generally a reloaded ammo issue and not common with factory ammo.... at least none that i've tried..
but oh ya..... stay away from American Eagle LOL
 
eltorro said:
Was this supposed to be a smart comment?:HR:
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Not saying Beavis m305 would ever do such a thing,(Jeez, ya never heard of joke?) but it is not unheard of for guns in varying states of haveing been blown-up to find their way back on the market. Its not enough to have escaped death or injury, some will try to cheat a unwary buyer to get their money back too. Think of all the ringed barrels, bulged chambered, set back lugs and otherwise ruined and dangerous pieces are out there.
 
Dogleg said:
Not saying Beavis m305 would ever do such a thing,(Jeez, ya never heard of joke?) but it is not unheard of for guns in varying states of haveing been blown-up to find their way back on the market. Its not enough to have escaped death or injury, some will try to cheat a unwary buyer to get their money back too. Think of all the ringed barrels, bulged chambered, set back lugs and otherwise ruined and dangerous pieces are out there.
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I would never stoop to that level. Depending on how my pursuit of a warranty goes, it may end up getting sold, but for PARTS ONLY. It will be made clear to the buyer. Not gettin pissy at anyone, just sayin.
 
speaking of bulged barrels

I was at my local today and saw a used 22lr with not one but three bulges in the barrel. They were totaly honest about it and had it marked on the price tag but I thought that one bulge was bad holy crap.
 
If i were representing norinco

I would give you a brand new one and a bag of spare parts just to make a customer happy.
 
tiriaq said:
It is normal for rounds cycled through M-14s, M-1s, ARs, etc to have a mark left on the primer by the firing pin. It results from the floating firing pins used in these designs.
I have never, ever, seen a protruding primer on an unfired factory cartridge.
Given what happened, if you cycled five rounds through the rifle prior to going to the range, you were really lucky that the slamfire did not occur off-range. Could have made for an even worse experience.
I don't know why your rifle fired unlocked. Could be something as simple as grease inside the bolt preventing free movement of the firing pin. Could be a problem with the timing of the camming cut in the receiver and the tail of the firing pin. The rifle is going to have to be inspected by someone very familiar with this type of rifle.
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...notice the grease in the picture ?
 
raindog said:
Really? ........... http://www.thegunzone.com/m1akb.html
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That was a very very interesting report. I was even more interested in the Fulton Armory conclusion that tiny cracks had developed due to a barrel that wasn't properly manufactured.

I do not want to hijack this thread, but as the report stated there were no stampings on the barrel and it was definitely not USGI, was this rifle re-barreled? I dont see any comments refering to the original owner re-barreling the rifle. The Fulton Armory report stated the rifle was used and abused. The owner commented that the rifle only had 5000 rounds maximum through it. They stated the barrel had absolutely no markings stamped into it as well.

I am lead to conclude, that he bought what he thought was a USGI barrel, but it was a manufactured reject (from god knows where) and not stamped, someone got their hands on it and sold it for cash before it was disposed of, and then he mounted it on his rifle. Would this be an accurate assumption?
 
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