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Discussion Starter #1
...I'm asking this for a friend. He is experiencing vertical brass marks on the receiver just behind the ejection port and above the charging handle. They're consistent and obviously being made by ejected shells. He's read that this could be due to over-pressure and adjusting the gas system for 168gr remedies this problem, he's shooting Federal Premium GM308M 168gr SMK BTHP. Any thoughts?
 

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Discussion Starter #3
Thanks P, that'll do it! :?
 
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