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Message: <blockquote data-quote="John R. Reist" data-source="post: 3165969" data-attributes="member: 39483"><p>As soon as it started short stroking I began tweeking the gas block closed a few clicks at a time, and it just made the problem worse.The gas block has been wide open sense then with all brands of ammo tested. Have tried a H2 buffer and carbine buffer ,no differance. A friend suggested trying a lightened bolt carrier mayby? Had'nt thought of a flash can tho....come to think of it PSA also listes the 10.5 barrel uppers with a flash can.....always thought it was for looks. Didnt know it could effect function. Might try that . Thanks</p></blockquote><p></p>