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Message: <blockquote data-quote="jackary" data-source="post: 3898162" data-attributes="member: 11985"><p>I had a similar issue on a recent build but used a carbine receiver extension.  I swapped to a standard carbine buffer and spring from a heavier buffer and it eliminated the issue.  18” spr barrel rifle length gas, standard carbine receiver extension, had a H2 buffer starting off and swapped to the carbine buffer.</p></blockquote><p></p>