couple cases jammed in my AR

[Notalentbum]

I am new to the AR game. Last week I bought a Stag Arms model 3 in 5.56. I finally got a chance to run down to Atterbury to test it out today. After about 40 rounds, I had a case jam in the chamber. The ejector sheared off a part of the heel of the case. I borrowed a clearing rod from one of the other guys there and knocked it out. He left as soon as I cleared it. Third shot after clearing it, it jammed another one the same way.
The ammo was Independence 5.56 I got from Gander Mountain.
I wondered if the chamber got dirty and that is why it is jamming.
BTW, how do you clean the chamber itself?
Any ideas on the jamming? If it works, I am posting a pic of one of the cases that jammed.

 

[USMC-Johnson]

Subscribed for this one...i've never seen that before.

 

[SSGSAD]

I am new to the AR game. Last week I bought a Stag Arms model 3 in 5.56. I finally got a chance to run down to Atterbury to test it out today. After about 40 rounds, I had a case jam in the chamber. The ejector sheared off a part of the heel of the case. I borrowed a clearing rod from one of the other guys there and knocked it out. He left as soon as I cleared it. Third shot after clearing it, it jammed another one the same way.
The ammo was Independence 5.56 I got from Gander Mountain.
I wondered if the chamber got dirty and that is why it is jamming.
BTW, how do you clean the chamber itself?
Any ideas on the jamming? If it works, I am posting a pic of one of the cases that jammed. View attachment 21140

With a chamber brush.... or use any good spray, like Powder Blast, or some other brand...

 

[netsecurity]

Independence is reloaded ammo. Either reload your own, or buy factory ammo is my advice. Until then, I wouldn't worry about the gun being the problem.

EDIT: I might be thinking of a different brand. I was thinking this is funky ammo?

 

[Notalentbum]

The box doesnt say anything about being reloads. It says Manufactured in Israel, imported by Federal.
Never seen a chamber brush on the shelf. Have to go looking for one.

Matt

 

[indyjohn]

The box doesnt say anything about being reloads. It says Manufactured in Israel, imported by Federal.
Never seen a chamber brush on the shelf. Have to go looking for one.

Matt

I call shenanigans on the ammo. The cartridge appears to be not sized right for your AR's chamber. I would try different ammo before giving the gun to a smith or sending it back to Stag.

 

[M67]

Independence is reloaded ammo. Either reload your own, or buy factory ammo is my advice. Until then, I wouldn't worry about the gun being the problem.

EDIT: I might be thinking of a different brand. I was thinking this is funky ammo?

The box doesnt say anything about being reloads. It says Manufactured in Israel, imported by Federal.

Yup, Independence is new ammo, loaded in Israel and distributed by ATK, Federal.

Ultramax is reloaded ammo


Tainted Gander Mountain ammo

 

[rvb]

The ejector sheared

That was caused by the "extractor." The ejector is the round plunger doodad in the bolt face. It most likely was just bad brass.

What kind of extractor spring setup is it using? Remove the extractor (can push out the pin with the firing pin or bullet tip). Is it just a spring plus rubber insert, or is there an o-ring around the spring? Current trend is to over-spring the extractor which is hard on brass (but not usually THAT hard). Probably sheared when chambering it and the extractor skipped over the rim.

try some different ammo before blaming/changing the gun.

-rvb

 

[midget]

That was caused by the "extractor." The ejector is the round plunger doodad in the bolt face. It most likely was just bad brass.


What kind of extractor spring setup is it using? Remove the extractor (can push out the pin with the firing pin or bullet tip). Is it just a spring plus rubber insert, or is there an o-ring around the spring? Current trend is to over-spring the extractor which is hard on brass (but not usually THAT hard).

-rvb

This.

 

[Notalentbum]

Actually after thinking about it I forgot that just before I had the jammed case, I ran 10 rounds of UMC .223 through it. Am I correct in thinking that .223 is okay in a 5.56 but not necessarily the other way around? Next outing I will run more of the .223 and I only have about 60 rounds of the Independence left so I will see how the .223 does and shoot up the rest of the Independence at the range while I have something to clear the stuck round with handy.
Like I said, I am a bit new to the AR world but even I should have caught the extractor/ejector oops. Sometimes you get the wrong word stuck in your head and it even seems right till someone points it out! I will have to check on the extractor spring tomorrow. It's past my bedtime, zzzzzzz******,,.

 

[netsecurity]

Don't sweat terminology Nazis. Your 223 is fine in a 5.56 chamber, and I doubt you'll notice any difference at all (except obviously that we hope it works better than the Independence ammo).

Make sure you check your Independence brass for signs of overpressure, like a flattened primer, or especially a bulge at the rear of the case. I looked closely in your pic and did not see the bulge, but this would be a tell tale sign of too much powder. If you see signs of over pressure, don't use the ammo. I've not seen it happen myself, but the books say that signs of over pressure include problems with extraction, and I presume that is mainly due to the bulge (aka "incipient case head separation"). I didn't want to complicate things by bringing this up, but it is worth mentioning. Bottom line is that you should try other ammo before blaming the gun, but if you see bulging or flat primers it is dangerous situation.

 

[rvb]

Not trying to be a terminology nazi, just trying to be helpful and figured before I told him to look @ extractor springs, I should make sure he knew what the hell the extractor was... Gheesh.

-rvb

 

[metaldog]

If your rifle is chambered for .223/NOT 5.56, and you are shooting 5.56 ammo, then you are probably experiencing a cartridge jam.
See links for explanation of .223 vs. 5.56 ammo...
.223 Remington vs. 5.56 NATO: What You Don't Know Could Hurt You | Human Events
AR-15 5.56 Vs. .223 What the different? - Yahoo! Answers

 

[mvician]

Stag chambers are 5.56

 

[netsecurity]

Not trying to be a terminology nazi, just trying to be helpful and figured before I told him to look @ extractor springs, I should make sure he knew what the hell the extractor was... Gheesh.

-rvb

Sorry man, just kidding around.

 

[1911ly]

The box doesnt say anything about being reloads. It says Manufactured in Israel, imported by Federal.
Never seen a chamber brush on the shelf. Have to go looking for one.

Matt

I use a .45acp brush on my chamber. I clean the chamber around 1k rounds or if I think I am having a issue.

 

[TenZero]

OP, are you using a carbine or a rifle stock? If using a carbine stock which buffer are you using?

 

[Notalentbum]

OP, are you using a carbine or a rifle stock? If using a carbine stock which buffer are you using?

Standard stock that came with the gun. Stag Arms model 3 straight out of the box.

Model 3 | Stag Arms LLC

Matt

 

[TenZero]

Like others have said get the chamber good and clean first. If you still have problems it is possible your gun is over gassed and may need a heavier buffer. I would also try some other ammo of known quality.