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Discussion Starter · #1 ·
Before I post this on AR15.com and get beaten about the face and neck w/ the "noob" bat, I thought I'd bring it here.

My bushmaster XM15 AR is acting like a b*tch lately, the "spring" which forces the round out of the chamber won't fully eject the round. See action shot on the farm w/ camera phone:



Keep in mind, I've got MAYBE 300 rounds through this gun. Shooting .223 Remmington JHP, 5.56x45mm Ball Surplus Rounds, misc others. Nothing crazy and nothing hand loaded..

Here's an example of how far the rod comes out, as you can see it's not fully extended enough to force the round out:


While on the farm I tore down the gun, and put some oil in the hole for the spring and made it go back and forth a half dozen times, nothing seems to be holding the thing up, but after 2-3 more rounds it does the same damn thing again.

This is where I put the oil to try and resolve the issue:


I had 40 round through the gun before it started happening today, prior to today's shooting I DETAIL cleaned it. The last time I had it out I had 50 rounds and it started doing this... If I shoot the gun with JUST a round in the chamber the bolt comes back as if to extract, then loads the same round right back into the chamber...


ANY idea's on how I stop this from happening?!?
 
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Discussion Starter · #2 ·
You could have gotten a piece of lent or something in there when you detail stripped the bolt. I would take it back down and reclean. The excess oil could also be holding a bunch of crud in there like carbon and dirt.
 
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Discussion Starter · #4 ·
wouldn't a dry lube be more appropiate?? My AR180 acts funky sometimes when I hose it down ith oil....
 
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Discussion Starter · #5 ·
I found the problem...

Against my better judgement (not being a gunsmith) I decided to take the pin out which holds that spring & rod.

inside, I found 2-3 peices of very small broken brass. Not sure how it got inside the spring, but that's what was getting jammed in between the rod and housing.

I sprayed the entire thing w/ Hoppes "Blast Clean" to remove any oil, claned it up, lubed JUST the rings and put it back together...

I'm 99% positive that was the issue (the broken brass peices), I can't imagine that they were doing any GOOD to the situation.
 
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Discussion Starter · #6 ·
Yup, that sounds like that was the culprit. Let us know how it ejects next time you take it out.
 
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Discussion Starter · #7 ·
Don't worry about over lubricating your AR. Unless the stuff is just dripping off of the parts you aren't over lubricating. Also don't forget to stagger your gas ring gaps as well. If just two of the ring gaps line up you can have all kinds of trouble and unless you know to look at your ring gaps it can plague you for a while. A little trick is to drench your bolt face, just the bolt like in your pic. with CLP and then work an empty casing back and forth on the bolt face using the extractor as your pivot point. This works some of the oil into the channel where the ejector rod is. Also, push out the pin that holds your extractor and spring set-up to the bolt and remove all the brass shavings out of there as well. Happy shooting!
 
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Discussion Starter · #8 ·
GrovenSpringer said:
Also don't forget to stagger your gas ring gaps as well. If just two of the ring gaps line up you can have all kinds of trouble and unless you know to look at your ring gaps it can plague you for a while
Heard that was a rumor and not true. Many say the rings don't have to be staggered. I do stagger mine though.
 
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Discussion Starter · #9 ·
nikon777 said:
Heard that was a rumor and not true. Many say the rings don't have to be staggered. I do stagger mine though.
It is a rumor, completely false. So is the statement about an oily weapon being good. Sand LOVES oil...:sad:
 
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Discussion Starter · #10 ·
I have had shaved brass issues in my guns before. My G17 stopped running after about 5000 rounds because the extractor had shaved off so much brass over the years. I had to pull the slide internals and let them sit in my ultrasonic cleaner for about an hour. The tray was full of metal shavings.

As far as the rings being staggered...

I use a one piece gas ring. No staggering necessary.
 
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Discussion Starter · #11 ·
I was not aware of the "gas ring staggering" thing.

Rumors are ussually based in 10% fact.. Assuming it's 10% true, I'll stagger them so I'm not 90% wrong. ;)
 
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