Ar-15 failure to eject resolves with polymer mag????

Donvin999

Donvin999

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Hey guys so I brought my new ar to the range for the first time and I must say I was confused/disappointed! Every time I fired a round it failed to extract the oddest thong was that it not only took minimal force with a cleaning rod to remove spent casing but they also appeared to have had a portion of the rim ripped off! Tried using a different mag both preban colts and same results! Then someone said here try this pmag and it ran flawlessly!!! Any advice on what I can do to get these results with the colt mags I have? Thanks
 
Bring me your bolt and I will get it to work with any mag. I have run into this with new bolts all the time.
Thanks
John
413 579 1994
 
I was having the same issue with the one I built. Spikes lower with Daniels Defense upper. Once I went from steel mags to Pmags no more problems. Now one my new AR all I use is Pmags.
 
Take the extractor out and make sure it is not binding or gunked up. Clean this area up real good. Once the extactor is back in make sure that it piviots freely.
 
Does the extractor spring have an o-ring, perhaps the wrong side one? In my relatively more limited expierience, I've seen that cause the problem before.
 
Donvin999 said:
Hey guys so I brought my new ar to the range for the first time and I must say I was confused/disappointed! Every time I fired a round it failed to extract the oddest thong was that it not only took minimal force with a cleaning rod to remove spent casing but they also appeared to have had a portion of the rim ripped off! Tried using a different mag both preban colts and same results! Then someone said here try this pmag and it ran flawlessly!!! Any advice on what I can do to get these results with the colt mags I have? Thanks
Click to expand...


Not enough information given. With what you have given it sounds like pure coincidence.

Did you put the other mags back in and experience the same problem? If the mags had anything to do with it, the problem should have reoccurred

Did you examine the sides of the extractor to see if it was binding in it's slot? Is there sufficient spring tension on the the extractor to get it to engage the rim of the cartridge? Is the hook slot on the extractor free of debri and or cut deep enough to grab the rims?

Is the bolt carrier binding on the mag feed lips?

I'd focus more on the extractor itself and completely disregard anything to do with magazines. A NEW gun is not unlikely to have a glitch or two until parts surfaces are worn in and polished to eachother, particulalry the tight tolerance ones like the bolt to carrier and extractor to bolt and bolt lugs to barrel extension.
 
If you have an M4 style gun, take apart your bolt and make sure you have a black extractor insert and a black o-ring. also check the front face of your buffer and make sure it has an H imprinted on the front. I am guessing here but i think what is happening is the buffer is not an "H" and the BCG travels to fast during recoil the P-mag lips may be scraping the BCG as it flies by slowing it down. If this the case you need to slow it down with an H buffer. You can get both here:

http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm extractor spring 3pack.htm

http://www.bravocompanyusa.com/H-Carbine-Buffer-p/buffer carbine h.htm
 
I wouldnt want a AR that did not function with old 20 rnd GI mags,,,,,of course as long as the mags ar in working order.
Im relativly new to ARs with but so far 90% of all my problems find there way back to the magazines.
 
mac1911 said:
I wouldnt want a AR that did not function with old 20 rnd GI mags,,,,,of course as long as the mags ar in working order.
Im relativly new to ARs with but so far 90% of all my problems find there way back to the magazines.
Click to expand...

I think you need to find a better quality mag source.

In all the years I've dealt with AR mags, I've only crushed two. One for poor performance(pretty sure it was out of square) and the other that came apart at the spot welds. Other than that, they've been 100% reliable once refitted with MagPul non tilting followers(the best innovation in AR mags in their history.)
 
belt fed, I have only had a few problems with my ARs and mags. I purchased a large box of mags in all conditions
Been going through them. Have had about 10 out of 50 that needed some attention or discarded.
Along with the boxOmags I recieved more than enough of the anti tilt followers to replace all of them along with many springs and floor plates.

I just cant see relying on just the polymer mags in my AR. PS the mags that seem to be the most worn and abused are the ones that work.
 
mac1911 said:
belt fed, I have only had a few problems with my ARs and mags. I purchased a large box of mags in all conditions
Been going through them. Have had about 10 out of 50 that needed some attention or discarded.
Along with the boxOmags I recieved more than enough of the anti tilt followers to replace all of them along with many springs and floor plates.

I just cant see relying on just the polymer mags in my AR. PS the mags that seem to be the most worn and abused are the ones that work.
Click to expand...

Thats good and I agree, the ones with the worst finish are always the best performers.[thumbsup]
 
Whoops sorry guys I didn't notice this thread popped back up!! I took it apart gave it a through cleaning and lube it all up!! Then cycled the action manually for a couple hundred rounds (yes my finger was killing me!) and realized it was 2 out of the 5 mags I had that were the worst the reedlike were a little tight holding the round down and stopping proper feeding! Also de burred the feed ramps! Next trip to range had a couple failures to fire from light strikes realized I had the hammer spring in backwards flipped it and now it's good to go! Ofcourse I still need to run a few hundred rounds through her but the couple mags since then have been flawless! Btw specs are dpms lower spikes upper,buffer,lower pack re sport barrel Yankee hill bcg and forearm thanks!!
 
If it is leaving cases in the chamber and ripping rims, then the gun is over gassed. Adding extractor tension will help with the symptoms but is not a cure
 
Supermoto said:
If it is leaving cases in the chamber and ripping rims, then the gun is over gassed. Adding extractor tension will help with the symptoms but is not a cure
Click to expand...

I had the same problem with a different cause. After about 30 rounds of rapid fire my AR would start to leave cases in the chamber with torn rims. The problem was a rough chamber and the cure was polishing. I had this problem with two .223 DPMS barrels. This is why I am not much of a DPMS fan anymore.
 
Donvin999 said:
Btw specs are dpms lower spikes upper,buffer,lower pack re sport barrel Yankee hill bcg and forearm thanks!!
Click to expand...
It seems the root of your problem are a number of questionable parts. What chamber does the bbl have (.223 or 5.56)? How big is the gas port?
Whose barrel do you have again?
Is the BCG properly staked?
 
This thread is why I no longer buy any AR parts or rifles from anyone that does not follow the M16 TDP as faithfully as possible.

That means LMT, Daniel Defense, Bravo Company, Colt, Larue, and Noveske would be about it for me.
 
andy t said:
It seems the root of your problem are a number of questionable parts. What chamber does the bbl have (.223 or 5.56)? How big is the gas port?
Whose barrel do you have again?
Is the BCG properly staked?
Click to expand...
Chamber is 5.56 the barrel came from remsport it is one of the m4 factory overruns listed for sale here on the boards. And yes the bcg is properly staked! The problem with the fte seems to have been a dirty chamber and my lack of a chamber brush! Everything seems to have been resolved now!
 
Donvin999 said:
Chamber is 5.56 the barrel came from remsport it is one of the m4 factory overruns listed for sale here on the boards. And yes the bcg is properly staked! The problem with the fte seems to have been a dirty chamber and my lack of a chamber brush! Everything seems to have been resolved now!
Click to expand...

I would check the gas port size
 
Donvin999 said:
Chamber is 5.56 the barrel came from remsport it is one of the m4 factory overruns listed for sale here on the boards. And yes the bcg is properly staked! The problem with the fte seems to have been a dirty chamber and my lack of a chamber brush! Everything seems to have been resolved now!
Click to expand...

It's not the dirty chamber, you should be able to run a few hundred rounds through an M4 with out all the issues your having. Notice how people are saying it's over gassed and to check the gas port size. If the gas port is larger than spec the your gun will be over gassed.
 
I will echo what Jose said about buying a quality AR upper from the companies that he listed. Also, just because it's labeled as a 5.56 doesn't mean it's so. Just look at all RRA/Oly/DPMS 5.56 barrels. The only way to be certain is to use a 5.56 reamer to see if any material is removed from the chamber, or buy from a company that is known to make in - spec chambers.
Doesn't Remsport use oversized gas ports for "reliability" reasons?
 
Son of a...... I took the rifle back apart and measured the gas port and it measures in at a full tenth if an inch!!! It's bigger than rifle spec!! Freaking a!!! I have a flash hider perm installed what's the best way to resolve this?? Also noticed almost every casing hits the deflector and I already blew a gas ring!
 
Donvin999 said:
I'm looking at an adjustable gas tube I'll probably pick one of those up can't bring myself to throw something away that I paid $170ish for!
Click to expand...

I put an adjustable gas block on mine, it blew a hole in the gas block in about 100 rounds. Best bet is another barrel

AR15barrels does make a shim for worn out gas ports but I'm not sure it will work on a port that oversized
 
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