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So I just bought a new ar 15... It's a palmetto built upper on a mag tactical lower... Anyway, I shot it 10 times today and noticed after picking up the brass that there is an nick/scratch (deep) in each and every case!!!:( exact same spot!!! Is this caused by a burr in the chamber? Something else?
Thanks
 

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Your barrel chamber is just fine & there is nothing wrong w/ your rifle. :yup:
Congrats and happy shooting!
 

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Depends on what type of ammo you're using. I noticed with my very hot loads the brass would actually imprint the chamber grooves.

If you can post a picture of what you mean we can try to see the problem
 

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Not caused by the chamber but by striking some part of the rifle during ejection. Look around the ejection port and deflector for a small brass colored shiny spot, that will be where the brass is impacting and getting dented. I reload also and have not had any problems caused by small dents.
 

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Yeah thats not normal looks like there may be something in the chamber. I rarely come across brass like that.

I would recommend removing the upper and the barrel, and physically checking for any burs or defect.
 

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Might be the brass is impacting the rear or front portion of the chamber port. Try changing buffer weights or shooting a different load.
 

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What brand upper are you shooting? (does it have a brass deflector?)
Barrel length?
Gas system length?
What buffer are you running?
Are the ejected cases landing consistently in the same area?
Where are the ejected cases landing?
 

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It's common with ARs/M-16s. Don't worry about it. It will go away on the next firing. I've been reloading them for years and it's never been an issue. Most every 5.56 case I collected in my service days has that identical smilie.
 

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It's common with ARs/M-16s. Don't worry about it. It will go away on the next firing. I've been reloading them for years and it's never been an issue. Most every 5.56 case I collected in my service days has that identical smilie.
^^^^^ This ^^^^^
 
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