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Old January 5, 2014, 10:05 PM   #1
skizzums
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ar15 dimples brass

hey guys, i have an arrow arms ar15
http://www.arrowarms.net/aarms/index.php?cID=139

have had it over a year but have only shot it about 2-300 rounds, i havent collected my brass until a couple days ago and noticed these dimples right about halfway up the case, my other ar does not do this and couldnt really see what would be causing this

http://s998.photobucket.com/user/nwa...04670948781451

any ideas?
i will also post this in the reloading forum

thanks for any help
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Old January 5, 2014, 11:03 PM   #2
DubC-Hicks
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I've actually noticed some batches of Winchester 5.56 have dinged up cases. The last 4-5 boxes I've bought had dents and dings somewhat similar to yours.

But that could also be from an overgassed rifle slamming the brass into the deflector. I've seen that too. A heavier buffer would likely fix it if that's the problem.
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Old January 6, 2014, 12:53 AM   #3
Chinny33
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it is the brass hitting the deflector.

I still reload them.
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Old January 6, 2014, 01:18 AM   #4
Brotherbadger
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Quote:
it is the brass hitting the deflector
Yup, that's my conclusion as well. As long as it doesn't cause a sharp dent(no reason it should), that brass is fine for reloading.
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Old January 6, 2014, 01:33 AM   #5
Jimro
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You could try a heavier buffer to change the ejection angle by reducing the rearward velocity of the BCG.

Or you could just reload the brass and shoot them again.

Jimro
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Old January 6, 2014, 01:40 AM   #6
skizzums
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oay, not so concerned with the brass, as long as its not a problem for the rifle, i dont really care

its shoots rapid no prob and doesnt have any issues, so i guess ill just not worry about it

thanks everyone
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Old January 6, 2014, 02:08 AM   #7
Brotherbadger
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Nope, no problem. Rifle functions as it should. That's what the brass deflector is there for. Keep shooting.
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Old January 7, 2014, 09:57 PM   #8
5whiskey
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I have a CMMG that does the same thing with hotter ammo. I reload them with no issues.
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Old January 8, 2014, 05:26 AM   #9
Jim243
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Quote:
as long as its not a problem for the rifle,
No problem, your rifle is working fine.

Jim
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Old January 9, 2014, 12:05 AM   #10
Sky_DiveR
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Your rifle is functioning fine. The brass is hitting the case deflector on the receiver.

If your other rifle does not do that, you may want to see where your brass is flying. A properly functioning rifle should throw the brass about 3-4 o-clock. 1 or 2 o-clock is over gassed or too light a recoil spring or buffer.

Edit: Information corrected

Last edited by Sky_DiveR; January 9, 2014 at 11:07 PM.
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Old January 9, 2014, 01:57 AM   #11
DubC-Hicks
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Sky-diver, that's not quite right. 1 and 2 o'clock is overgassed. The brass is getting slammed against the deflector, throwing it forward. A properly gassed rifle ejects between 3 and 4 o'clock. Anything farther back than that is somewhat undergassed.

I usually find a buffer that makes my rifle eject hotter 5.56 at around 3:00, so it still ejects low powered stuff fine, too.
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Old January 9, 2014, 11:09 PM   #12
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DubC-Hicks, you are absolutely correct and I corrected my previous post. My diagnostics have been reversed all day (yesterday) for some reason. Perhaps having a "senior" day?
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