I'm having FTF/FTE issues with my 14.5 POF 308 with a QD Surefire FA762K suppressor. I've fired the rifle many times without a suppressor with no issues. I turn the adjustable gas block to "suppressed" mode and most times the spent case won't eject or the bolt doesn't cycle all to the rear and gets jammed up against the magazine with another round beneath it. Any suggestions?