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View Full Version : Pic of problem with my new AR build, opinions


ptoguy2002
10-01-2008, 10:03 AM
http://i71.photobucket.com/albums/i123/ptoguy2002/ATT250308.jpg

extractor, ejector?

I can't tell if the fired case isn't coming all the way out, or it is and just not ejecting. It stays in and gets jammed in with the new round stripped out of the mag.
Been shooting ARs for years, all stock factory though, and have never had any repeatable failures, so I don't have a lot of experience troubleshooting these and would appreciate some insight from those that do.
Happened 4 times out of 100 rounds. 2 with surplus mil 5.56, once with federal boxed XM193, and once with black hills 5.56.
Its a new build, kind of a mutt rifle, built with leftovers or never useds, Bushmaster upper and bolt, double star lower, who knows what lower parts.

stphnman20
10-01-2008, 10:08 AM
I would try switching out the extractor and spring... Start with that and see what happens

Linus
10-01-2008, 10:16 AM
First thing I think about is a stiff buffer spring not allowing the bolt carrier group enough room for proper ejection.
My $.02

Stockton
10-01-2008, 10:21 AM
All from the same magazine? New or old?

scubamark13
10-01-2008, 10:27 AM
I had the same problem with my Stag I installed one of these
http://mgimilitary.com/dring.htm
Problem solved.

Good luck,

jb7706
10-01-2008, 10:31 AM
Any damage to the case where the extractor engages? Crud build up in the extractor groove?

stphnman20
10-01-2008, 10:33 AM
I had the same problem with my Stag I installed one of these
http://mgimilitary.com/dring.htm
Problem solved.

Good luck,
Interesting!

ptoguy2002
10-01-2008, 10:36 AM
All from the same magazine? New or old?

All from the same mag, bush master 10rnd with magpul follower.
Shouldn't be the mag though, as the fired case never made it out.

scubamark13
10-01-2008, 10:46 AM
Interesting!

I actually put one on all of my OLLs even though the others never had a problem. I haven't had any problems with any of them since. Best money spent I recommend it.

What kind of upper is it?

ptoguy2002
10-01-2008, 4:57 PM
What kind of upper is it?

Bushmaster

ptoguy2002
10-01-2008, 4:59 PM
Any damage to the case where the extractor engages? Crud build up in the extractor groove?

Just checked the extractor when I got home, looks fine visually.
Nothing special noticed on fired cases. I did look.

frigginchi
10-01-2008, 5:02 PM
Are you lubing it?

ptoguy2002
10-01-2008, 6:25 PM
Are you lubing it?

yup, just as much as my other factory rifles, which isn't much

jb7706
10-01-2008, 8:51 PM
Does the ejector stick when depressed/not move freely? Give your bolt a good cleaning. Possibly something binding the ejector. Make sure nothing built up between extractor and bolt, ensure no extractor chips or cracks. Replace the extractor spring. I could be way off the mark, too. AR15Barrels may have some other suggestions.

redcliff
10-01-2008, 10:32 PM
Have you tried loading the magazines with one round and verifying the bolt locks open after each shot? It's usually best to eliminate things like short-stroking and insufficient lube before you start replacing parts.

aplinker
10-01-2008, 10:33 PM
First off I can already tell you that you'll need to run your BCG wet. Much wetter than other rifles. Spray it liberally with CLP, shake, and install.

Don't start replacing parts until it's diagnosed properly. Carbine "fixes" are last measures - including o-rings and springs


-is one cartridge full and one empty? Both loaded?

-does this happen always or occasionally?

-is your rifle new?

- barrel length?

-gas system? (carbine, rifle, mid)

-have you tried any other mags?

-any other ammo?

-if you load one round in the rifle does it lock back the mag when fired? does the round eject?

-do rounds eject by hand?

-which buffer and receiver extension are you using (is it marked)?

-

ghost
10-01-2008, 10:38 PM
i had the same problem,it was from not having enough lubrication.i`ve been using slip2000 no more jams,for some reason clp wasnt working for me.

randy
10-02-2008, 12:42 AM
Run it WET

ar15barrels
10-03-2008, 10:09 PM
Its a new build, kind of a mutt rifle, built with leftovers or never useds, Bushmaster upper and bolt, double star lower, who knows what lower parts.

Over-gassed carbine.
Put in a heavy buffer and an o-ring on the extractor spring.
Boom...................done.

OCArmory
10-04-2008, 7:55 AM
+1 one for the heavy buffer and the upgraded extractor. I had the same problem. I would try the cheapest fixes first. Add some more lube. If that doesn't work upgrade the extractor. Then I would move to a heavy buffer.
Mike