Originally Posted by
Iraqgunz
Robb,
I am just pissing in the wind on this. Would definitely like to see some pics and find out what damage was sustained and the end cause. Hopefully we will get some more poop when everyone is done doing the fingerbang.
I don't think you are dude,
I missed the part about Hornady getting it apart and finding no damage.
I'd like to see the parts and the rifle as well. I'm sure there more damage then Hornady is telling him. ARs don't just vent gas through bottom of the chamber for no reason, I know he said the case ruptured but that shouldn't really do anything except get stuck in the chamber. The bolt shouldn't have unlocked before the pressures within the barrel had significantly dropped. I think it's probably a combination of things. Too tight and a very dirty chamber, a bad case, too big of a gas port, too light of a buffer (bolt moving too early)...........all for the perfect storm, if you will.
Papabri:
**UPDATE**
Both the AR and the remaining 298 rounds were sent to Hornady in Nebraska. Todd at Hornady has been very helpful in letting me know what they are doing.
He was able to get the spent case out, and it suffered a case separation at the rear of the case (sorry, no pics). What they don't know as yet is what caused the separation.
Hornady did a lab test on the remainder of what I sent back and found no annealing problems. Todd shot the remainder of the box I opened and all fired without a problem.
He said that DPMS will get the gun from him and do their own inspection.
Todd said that from what he could tell, there was no damage to the rifle. They were also going to do some sort of chamber cast to see if there are any deficiencies with the chamber.
I'll provide another update when I know what the next step is. I'll ask Todd at Hornady about the suspicion about soft points. I'm no expert, but it would seem like a soft point, as opposed to a FMJ, would take up the pressure if it misfed, and not push the bullet further into the case.
It's pretty damn weird to me. I've only seen guns this has happened to and it was all 'Canned Heat' ammo which uses military cases that are often from M249s which lengthens them and makes them weaker.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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