I have an XD40 with a EFK Fire Dragon 9mm Conversion Barrel. I have fitted it and shoot it way better than I shoot the 40. I am having alot of problems with it not wanting to eject the 9mm casing before feeding the new round. Any body have any suggestions on what I need to do. That is using both the 40 cal magazines and 9mm magazines. I am shooting WWB ammo.