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Rough AR-556 chamber shoulder finish.

This is a discussion on Rough AR-556 chamber shoulder finish. within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; Got into the AR15 game with the purchase of a Ruger AR-556 beginning of this year and shot 100 rounds of American Eagle 5.56 without ...


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Old February 20th, 2017, 10:56 PM   #1
 
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Question Rough AR-556 chamber shoulder finish.

Got into the AR15 game with the purchase of a Ruger AR-556 beginning of this year and shot 100 rounds of American Eagle 5.56 without any issues this past weekend. However, the shoulder of all the fired brass had concentric scratches on it. Seems like the shoulder area of the chamber has rough concentric ridges which I confirmed by running the tip of a long wooden toothpick along the shoulder area and was able to get the tip to snag on the ridges. The brass must be pressing against the concentric ridges as it expands against the chamber wall.

Can this pose a danger with hot gases escaping past the brass because it does not have a smooth chamber to cling against to seal the hot gases?

Also, is this brass safe for reloading?

Would prefer not to have to return it to Ruger or where ever since i'm in Canada.

Thanks in advance.
Anthony.
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Old February 20th, 2017, 11:44 PM   #2
 
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I don't know if it's dangerous or not, but it's not right. Could cause problems. I would give Ruger a call and send them the pics.
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Old February 21st, 2017, 12:43 AM   #3
 
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Did you try to insert a round and eject it unfired ?
Are there any scratches in that case ?


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Old February 21st, 2017, 07:17 PM   #4
 
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Unhappy

Hi QuailHunter,
I chambered a couple of rounds and ejected it without firing and faint but noticeable rings appeared on the shoulder of the cycled brass as shown in the pics. Not as severe as the rings left on the fired brass which really highlights the roughness of the chamber at the shoulder area. As Bozz48 said this is definitely not right and demonstrates to me that the chamber was not finished properly. I'll contact Ruger about returning the rifle to fix the issue.
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Old February 22nd, 2017, 03:57 AM   #5
 
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Quote:
Originally Posted by alumdc View Post
Hi QuailHunter,

I chambered a couple of rounds and ejected it without firing and faint but noticeable rings appeared on the shoulder of the cycled brass as shown in the pics. Not as severe as the rings left on the fired brass which really highlights the roughness of the chamber at the shoulder area. As Bozz48 said this is definitely not right and demonstrates to me that the chamber was not finished properly. I'll contact Ruger about returning the rifle to fix the issue.


Thank you sir.
Clearly contact Ruger. I will do the same test in mine later tonight and try to come back with pictures.

Interesting


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Old February 22nd, 2017, 04:28 AM   #6
 
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Very interesting. I don't reload, so I don't ever pay much attention to my spent brass.

I'll check mine out closer next time I'm at the range.

Please keep us updated on how this turns out for you.
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Old February 22nd, 2017, 11:21 AM   #7
 
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No sign of rings or any other scratch on my AR 556. I Chambered 4 rounds (safety on), ejected them.
In one or two you may see a light mark of the rifling.

For sure contact Ruger support.



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Old February 22nd, 2017, 11:53 AM   #8
 
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Contact Ruger, that's poor matching and it looks like you may have a couple of burrs in your chamber causing those neck scratches.
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Old February 22nd, 2017, 08:37 PM   #9
 
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Thanks QuailHunter for doing the test and confirming that cycled brass should not come out looking like it went thru a meat grinder.

I did contact my dealer and he was good enough to suggest that I bring it back to the store and they will ship it back to Ruger for warranty service. Hesitant to do that because with the strict laws here one needs a permit just to transport a gun from one room of the house to the next . Waiting for response from Ruger's customer service department.

Part of me says to just live with it because it did fire and cycle around 100 rounds without any issues. However, I do plan on reloading and suspect that I won't get much life out of the battered brass with the extra abuse it's taking from the rough chamber; might not even be able to remove the rings by resizing the brass. Just cannot afford to shoot the tons of rounds I know I won't be able to resist doing if I can't reload; the AR 556 is just too much fun. Also, I'm afraid that this might lead to a bigger failure like hot gases escaping from the chamber because the brass could not stick sufficiently to the rough chamber walls.
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Old February 23rd, 2017, 05:21 AM   #10
 
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I just looked at my spent brass and it to has those same lines,maybe less pronounced than yours. Maybe just a Ruger thing? Keep us posted.
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Old February 23rd, 2017, 11:00 AM   #11
 
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Rough AR-556 chamber shoulder finish.

I add a picture of some fired brass through my AR 556.
These are Geko 223, IMI 223 and S&B 223.
No signs or other marks




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Last edited by Quailhunter; February 23rd, 2017 at 11:39 AM.
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