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Posted: 6/19/2014 6:35:44 PM EDT
I just finished a 300 blackout build and it is scratching rounds. I load a dummy round to get ready to load up some ammo to go to the range and I noticed the scratches.
The round has been chambered 4 or 5 times but I've never seem scratches like this.
Is this normal? Has anybody else seen this?
Any help would be appreciate.

http://www.smugmug.com/photos/i-vCFjwwz/0/M/i-vCFjwwz-M.jpg
Link Posted: 6/19/2014 6:55:52 PM EDT
[Last Edit: 6/19/2014 6:56:16 PM EDT by jasonusvi]
Who manufactured the barrel? Looks like they need to polish the chamber or replace the barrel in total. I had a BHW 6.5 PCC barrel leave the following welts on fired brass and they replaced the barrel:

Link Posted: 6/19/2014 7:12:30 PM EDT
It's an AAC barrel, I haven't contacted them yet.
Link Posted: 6/20/2014 8:17:49 AM EDT
Someone suggested that I clean the chamber and locking lugs up because there might be some metal shavings in there.
After cleaning it I tried to chamber another round and it was a huge improvement,
you can still see some scratches but they are minor. I think it will work itself out after shooting a few hundred rds through
it and cleaning it again.
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