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Thread: AR-15 Ejection question
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March 8th, 2012, 12:02 PM #1Active Member
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AR-15 Ejection question
Hello,
I was shooting my AR-15 yesterday and for the first 90rounds the shell casings would eject and land about 8' to the right. Then on the 4th mag half way through they shells started basically just landing on the rest next to the rifle. Also about every 5th round, I could feel a shell bouncing off the side of my hat.
What would cause this issue and what should I be looking at on the rifle?
I pulled the bolt while at the range and looked it over, but saw nothing out of the ordinary. Also tried 2 more mags and the problem remained.
Thanks for any advise you can give.
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March 8th, 2012, 12:46 PM #2
Re: AR-15 Ejection question
What brand is the gun? If it's a build, what brand is the bolt carrier group?
Shooting steel or brass ammo?
It's likely that the casing are sticking in the chamber just a little or the gun is experiencing hard extraction. Once the chamber heated up, if it was slightly undersized or the ammo was junky, it could cause that problem. It also could be a weak extractor spring possibly.
I'd say switch to some different ammo and try it again. Give it a go with a some more rounds and see how it works. Give the BCG a good cleaning and lube.
A combo of weak ammo, stiff buffer spring, too heavy of a buffer, tight chamber, bad extractor /spring, undersized gas port, or a combination of any of the above could cause that problem.
If it's a 16" or larger barrel gun it should run 100% even with cheap steel ammo. Some short SBR's are iffy due to reduced backpressure. I have an 11.5" piston SBR that still won't run 100% unless suppressed with cheap Tula. Still need to work on it a bit.CDS ARMS.com - 'LIKE' Us - MG Rentals - Colt Defense AR-15 & Glock Certified Armorer
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March 8th, 2012, 12:53 PM #3Active Member
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Re: AR-15 Ejection question
Its a Bushmaster Co-witness flat top. I only shoot Brass cased ammo in it.
Currently its the American Eagle brand that i got at Cabela's.
Thanks for the advise so far. I will break down everything and see if i see anything and clean it up good.
Its just odd to me that it was working fine then all of a sudden started having issues. I did just clean and lube the bolt assembly the night before. Is it possible i put to much or to little lube on parts? I used this as a guide as to where to lube and how much.
http://www.weaponevolution.com/forum...15-LUBE-POINTS
I did not do anything with the buffer tube assembly. Only the Bolt assembly.
Thanks
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March 8th, 2012, 01:15 PM #4
Re: AR-15 Ejection question
Is this a brand new rifle? Have you shot it before?
Toujours prêt
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March 8th, 2012, 01:37 PM #5Active Member
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March 8th, 2012, 02:01 PM #6
Re: AR-15 Ejection question
Did you notice any difference in the recoil in conjunction with the change in ejection?
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March 8th, 2012, 02:06 PM #7Active Member
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Re: AR-15 Ejection question
I honestly did not notice any difference in the felt recoil. I don't know if it matters but during recoil you could hear the spring in the buffer tube make a "springy" sound. I know that's not exactly the best description but that's the only way i can think to explain it. It made the same sound while shooting the rounds that ejected fine though.
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March 8th, 2012, 02:07 PM #8Super Member
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Re: AR-15 Ejection question
did you change your ammo half way through? Different brands can perform differently.
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March 8th, 2012, 02:08 PM #9Active Member
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Re: AR-15 Ejection question
There were no ammo changes
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March 8th, 2012, 02:09 PM #10Super Member
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Re: AR-15 Ejection question
Last edited by redturbo0; March 8th, 2012 at 02:14 PM.
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