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Posted: 5/23/2010 12:00:36 PM EDT
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Prior to Malfunction: 350 Rounds 556 Unsuppressed 200 Rounds of 22LR Suppressed (CMMG) 100 Rounds 556 Suppressed The gun has not been cleaned, but has been kept "wet" with CLP. All this shooting is not in one session. On the last round of the last mag (556), I pull the trigger and there is no sound of hammer drop (and gun bang).I looked at the bolt and the gun is out of battery. This happens every once in a while with my bulk reloads when the bullet is seated missing the cannelure. Then when the case is crimped it swells and will not fully chamber. I pulled back on the charging handle but the bolt carrier was jammed. The next step of course involves hitting the butt of the rifle on the ground while pulling back on the charging handle to open the bolt. I have never had one stuck this bad. Finally the bolt is far enough back that and empty case ejects (surprising to me). Using an armor's tool I removed the buffer tube and the lower, then between prying against the bolt carrier and hammering on a cleaning rod I was able to get the bolt and carrier removed. The kicker is I am unable to find anything wrong, out of place or broken. I wiped the slime off the pieces, and put the parst back in the gun and everything seems to function, but I have not test fired. I'm not going to lie, the gun was nasty and needed to be cleaned, I just wanted to see where the line was with how dirty the gun could be and I guess I found it. Does anyone have any idea what the malfunction could have been. Everything seemed to be locked up too tight to be just slime. Thanks ETA: The gun is a factory stag m4gery. |
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My guess would be the 300 rounds of suppressed .22 and 5.56. 650 rounds of 5.56 wouldn't normally cause a slime, but I would think that with the amount of suppressed and .22, you'd be accumulating a lot of crap that otherwise wouldn't be there.
The same thing happened to me when trying to run a .22 kit in my DDM4. I pulled the kit out and it wouldn't fire 5.56. I pulled the bolt apart, wiped it down and relubed it. Ran several hundred rounds fine until I left for the day. I've run about 700 rounds through my rifle without cleaning it, and the .22 kit was the only point where I had any issues. |
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stop using clp and get a heavier viscosity lube. as the clp evaporates it makes a dirty situation worse than if you had a lube that did not.
i put about 1000 rds of all kinds of assorted ammo (no wolf/brown bear or any of that nasty kind of stuff) through one of my uppers that i lubed with tetra gun pre lube and light grease, and had only one failure, and it was mag related. heavier lubes do help A LOT. mobil 1 synthetic motor oil or royal purple synthetic SAE30 both work exceedingly well. your problem was probably grime related. |
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Just a guess but the only malfunctions I've ever experienced which locked the bolt and carrier were popped primer related. If you weren't paying attention when you got it apart the offending primer or anvil probably fell out unnoticed. I'd be checking my brass for a missing primer. |
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